Fixed issue boards issue sorting when dragging issue into list

## What does this MR do?

Currently it just appends the new issue to the end of list & then sorts by priority which can cause some strange effects. For example if you drag the issue to the top of the list & then vue re-renders, the issue actually goes to the bottom.

This changes that by adding the issue at the specific index.

## Screenshots (if relevant)

![boards-sorting](/uploads/9aa4a0cb5e0be79e7d24ab2b6abb0bbb/boards-sorting.gif)

See merge request !7734

Pick valid event objects for the events list

## What does this MR do?
Fixes JS error when loading events with possible `null` objects

## What are the relevant issue numbers?
Closes #24836

See merge request !7689

You can only assign default_branch when editing a project

Related to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7726

See merge request !7741

You can only assign default_branch when editing a project or when creating a project for a specified user [ci skip]

You can only assign default_branch when editing a project [ci skip]

changes environment.last_deployment to a try expression so it does not fail if e…

## What does this MR do?

Fixes the call on `environment.last_deployment` to not break when `environment`is not yet set.

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #24779

See merge request !7671

Don't convert data which already is the target type

With Grape's DSL we already enforce data types. We don't need to explicitly convert to string if there is already one.

See merge request !7740

Move admin spam spinach test to RSpec

See merge request !7708

Merge branch '24908-install-instructions-seem-to-have-two-database-steps-out-of-order' into 'master'

Fix documentation to create the `pg_trm` extension before creating the DB

Closes #24908

See merge request !7735

Add missing documentation.

## What does this MR do?

Add documentation to Build events on webhooks

See merge request !7717

Add default_branch attr to Project API payload in docs.

See merge request !7726

Document that we always use `do...end` for `before` in RSpec

[ci skip]

See merge request !7697

Add missing JIRA file that redirects to the new location

See merge request !7736

Currently it just appends the new issue to the end of list & then sorts by priority which can cause some strange effects. For example if you drag the issue to the top of the list & then vue re-renders, the issue actually goes to the bottom.

[ci skip]

[ci skip]
Signed-off-by: Rémy Coutable <remy@rymai.me>

[ci skip]
Signed-off-by: Rémy Coutable <remy@rymai.me>

Backport Note#commands_changes from EE

One small thing from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/870 that was missed in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7604.

/cc @rdavila

See merge request !7730

Log mv_namespace parameters

[ci skip]

See merge request !7729

Add nested groups support to the routing

## What does this MR do?

It allows routing with `/` in namespace name 

## Why was this MR needed?

For nested groups feature(https://gitlab.com/gitlab-org/gitlab-ce/issues/2772). We need URI like `/group/subgroup/project` be routed correctly


## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- ~~[Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- ~~API support added~~
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/2772

See merge request !7459

Move admin abuse report spinach test to RSpec

https://gitlab.com/gitlab-org/gitlab-ce/issues/23036

See merge request !7691

Simplify copy on "Create a new list" dropdown in Issue Boards

## What does this MR do?

It changes the "Create new list" text to simply "Add list". It also describes the operation in a more concise way. It was suggested in #24659.

## Are there points in the code the reviewer needs to double check?

Although I refactored references to the name of the button to reflect the new text, I left part of the documentation unmodified:

File: `doc/user/project/issue_board.md`
```
In short, here's a list of actions you can take in an Issue Board:                 
                                                                                   
- [Create a new list](#creating-a-new-list).                                       
- [Delete an existing list](#deleting-a-list). 
```
because I was not sure if changing those was necessary.


Additionally, I replaced every occurrence of `click_button 'Create new list'` with `click_button 'Add list'`in the spec. I'm not sure if that causes any change in behavior as I am not sure if there are any hooks to the previous name, explicitly.

File: `spec/features/boards/boards_spec.rb`

## Why was this MR needed?

It is an improvement, as suggested in #24659

## Screenshots (if relevant)

**Before:**
![before](/uploads/cffd30b0e9a21d16bc25d046eb4ca42b/before.png)

**After:**
![after2](/uploads/95b049e0c1c565c4ccd1a72a3f4be925/after2.png)

## Does this MR meet the acceptance criteria?

- [X] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [X] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [X] All builds are passing
- [X] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [X] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [X] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [X] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
#24659

See merge request !7605

Move abuse report spinach test to RSpec

https://gitlab.com/gitlab-org/gitlab-ce/issues/23036

See merge request !7659

Remove heading ids from University docs

Having ids in headings was preventing the ToC to render correctly

See merge request !7720

[ci skip]

Fix `LFS enabled` select box.

A refactor of the project edit page caused the `lfs_enabled` setting to be reverted to a non functioning state. This MR fixes that.

This will most likely need to be ported back to 8.13 and 8.14. 8.12 contained the correct code.

Fixes #24645 

Related commits:

- ea3bbbde
- da07c2e4

cc @stanhu @dblessing @dbalexandre @rymai

See merge request !7716

Build was being triggered but there was no documentation about it, so
I'm adding what I was receiving from webhooks when implementing the
Rocketchat integration (https://github.com/PotHix/rocketchat-gitlab-hook).

Use Commit#author so we share logic and cache

See merge request !7715

It was not displaying the proper value and had an out of place look to it.

Closes #24900

move timeago.js to vendor directory

## What does this MR do?

moves timeago.js into `/vendor/assets/javascripts` for consistency with other external javascript libraries.

## Are there points in the code the reviewer needs to double check?

make sure timeago still works as it should...?  I don't see how this could have broken anything.

## Why was this MR needed?

consistency with our guidelines

## Does this MR meet the acceptance criteria?

- Tests
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See discussion in [!6274](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6274#note_18625583)

See merge request !7590

fixes non-retina shadow and browser zoom issue

## What does this MR do?
This MR closes #24851 and shadow issue for browser zoom 

## Are there points in the code the reviewer needs to double check?
NR

## Screenshots (if relevant)
**Ratina Display:**
![normal](/uploads/18fb0e321eff55cb89413745413cfe8a/normal.png)

**Non Retina**
![non-retina](/uploads/85ce8d3b22a025c251142bebe30c4401/non-retina.png)

**110% zoom**
![ratina](/uploads/bc0f2468ba780998e0e2b60a6d07e8db/ratina.png)

## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [x] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #24851

See merge request !7712

Use default `closest` if available!

## What does this MR do?

We should use the default `Element.prototype.closest` if its available.

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See merge request !7706