Add upvote/downvote fields to merge request and note API to preserve compatibility

As discussed in !1825 we should not break the API compatibility.

* This MR adds the fields `upvotes`/`downvotes` to the merge request API again, which always return `0`.
* Add the fields `upvote`/`downvote` to the notes API, which always return `false`

This behavior is documented in the API docs.

See merge request !1867

Make tag API for release feature consistent

Make tags API consistent with other tags methods. This changes the endpoint from `PUT /projects/:id/repository/:tag/release` to `PUT /projects/:id/repository/tags/:tag_name/release`.

On thing the API is still missing, is an error if the tag does not exist. Right now it returns 200 even the tag does not exist. I'll fix that such it returns 404.

@stanhu Can you review?
@rspeicher This MR should go into 8.2

See merge request !1864

Award Emoji: fix for merge requests

Closes #3597

See merge request !1865

[ci skip]

Remove accidentally added line.

Reference: #3598 

See merge request !1858

Fix Drone web hook URL not being updated

Fixes regression of !1774: fixes Drone Web hook for both service templates and project services.



See merge request !1856

Use award emoticons in GitLab workflow

Remove the old voting slides and use the emoji bar.

[ci skip]

See merge request !1863

Add tags page to readme

The tags page was separated for the release feature but not to the index readme.

[ci skip]

See merge request !1861

Bump GitLab Workhorse version to 0.4.2



See merge request !1830

Lfs batch download to stable

!1842 for stable

See merge request !1853

Lfs on by default and backup



See merge request !1852

Fix for Emoji (to stable)



See merge request !1850

See merge request !1851

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Improve performance of user profiles, finding groups, and finding projects

This MR improves the following:

* Rendering of profile pages and Atom feeds
* Finding groups (using GroupsFinder & friends)
* Finding projects (using ProjectsFinder & friends)

Initially this MR was intended to only improve rendering of Atom feeds, but over time other fixes were introduced as well as the same code was the cause of all these problems.

See merge request !1790

Add clipboard button to merge request cross-project reference

See merge request !1847

Award Emoji

This it first iteration of award emoji feature.
We have plan to extend emoji picker by the next release.

For now, you can add award by clicking to the emoji picker or posting a regular comment with emoji like "👍" and any other. You can post not only emoji that listed in the emoji picker.

See merge request !1825

Commits without .gitlab-ci.yml are marked as skipped

- Commits without .gitlab-ci.yml are marked as skipped
- Save detailed error when YAML syntax

This also fixes: #3521 #3546 

/cc @jacobvosmaer 


See merge request !1827

Add a fallback for Safari copy-to-clipboard

Also, hide the tooltip in a less stupid way.

Closes #3547

See merge request !1844

Improve personal snippet access workflow.

Replaces !1709

Fixes #3258

See merge request !1817

Add option to create merge request when editing/creating a file

Replaces !1611 

Fixes #3059

See merge request !1820

Fix 'Attach a file' link in new tag form

Also removed a little bit of code repetition :)

See merge request !1834

Update gitlab-shell documentation to 2.6.7



See merge request !1836

Add link to git-lfs client  [ci skip]



See merge request !1832

Check which folders and archives should be packed before passing to tar command.

If user uses backup task with SKIP and skips one of the archives listed(uploads, builds, artifacts) backup create will give an error: `Cannot stat: No such file or directory`.

This MR fixes that by checking for skipped items.
Additionally, compact everything to avoid `TypeError: no implicit conversion of nil into String` errors.

See merge request !1824

Documentation for Git LFS

Doc explaining how to use Git LFS, how to use Git LFS with GitLab, known issues and troubleshooting tips.

See merge request !1813

Deploy page should be shown for all pages not just root

Related to change already merged to Omnibus - gitlab-org/omnibus-gitlab!540

This change makes it so the deploy page is shown on all GitLab pages if the page exists. Users will no longer receive the 502 when deploys are happening.

See merge request !1828

Do not limit workhorse POST/PUT size in NGINX

Limiting, if any, should happen in gitlab-workhorse.

See merge request !1831

Backport relevant changes from gitlab-org/gitlab-ee!51

To do:

- [x] Update gitlab-shell

See merge request !1822

[ci skip]