Refactor TrendingProjectsFinder to support caching

## What does this MR do?

This refactors `TrendingProjectsFinder` so it can support caching of the data. See cb7d398972d786ba7133418266fa34ae641b2497 for more details.

## Why was this MR needed?

Trending projects is quite slow, easily taking seconds to load the entire page.

https://gitlab.com/gitlab-org/gitlab-ce/issues/22164

https://gitlab.com/gitlab-com/infrastructure/milestones/4, in particular the section "Trending page under 2s"

See merge request !6672

Split routes on multiple files

Because current 1k routing file is just impossible to read and manage. 

See merge request !6692

== Public Projects

This finder class now _only_ returns public projects. Previously this
finder would also return private and internal projects. Including these
projects makes caching data much harder and less efficient. Meanwhile
including this data isn't very useful as very few users would be
interested in seeing projects they have access to as trending. That is,
the feature is more useful when you want to see what _other_ popular
projects there are.

== Caching

The data returned by TrendingProjectsFinder is now cached for a day
based on the number of months the data should be restricted to. The
cache is not flushed explicitly, instead it's rebuilt whenever it
expires.

== Timings

To measure the impact I changed the finder code to use the last 24
months instead of the last month. I then executed and measured 10
requests to the explore page. On the current "master" branch (commit
88fa5916) this would take an average of
2.43 seconds. Using the changes of this commit this was reduced to
around 1.7 seconds.

Fixes gitlab-org/gitlab-ce#22164

Refactor remnants of CoffeeScript destructured opts and super into ES6

## What does this MR do?

Gets rid of some CoffeeScript remnants that are difficult to work with, and updates them to use ES6 syntax/constructs. I updated nearby code to ES6, but these updates usually just included using the es6 class syntax and scoped variable keywords. 

**Important**: For the most part, I tried to avoid refactoring the design of the existing code. If I attempted that, this would've taken much much longer and it would've been out of this issue's scope. 

## Why was this MR needed?

The compiled coffeescript for destructured default params is very difficult to work in. 

These changes makes some of these rough patches more maintainable:

e.g.
![Screen_Shot_2016-09-19_at_4.43.08_PM](/uploads/40cd3f79b9c5f595f3738213b0dadbbf/Screen_Shot_2016-09-19_at_4.43.08_PM.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry 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 you do - 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?

Meta Issue: 
https://gitlab.com/gitlab-org/gitlab-ce/issues/21887

Child Issues: 

https://gitlab.com/gitlab-org/gitlab-ce/issues/21942

https://gitlab.com/gitlab-org/gitlab-ce/issues/21941

https://gitlab.com/gitlab-org/gitlab-ce/issues/21943

## To Test Manually: 

#### app/assets/javascripts/LabelManager.js.es6 -> [diff](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6261/diffs#diff-1)
- Navigate to [Labels](http://localhost:3000/gitlab-org/gitlab-test/labels) and click around (toggle label priority, add new labels, subcribe, edit, delete)

#### app/assets/javascripts/blob/blob_ci_yaml.js.es6  -> [diff](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6261/diffs#diff-3)
- [Create new file](http://localhost:3000/gitlab-org/gitlab-test/new/master) and give it the name `.gitlab-ci.yml`, then attempt to select a template

#### app/assets/javascripts/blob/blob_license_selectors.js.es6 -> [diff](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6261/diffs#diff-7)
- [Create new file](http://localhost:3000/gitlab-org/gitlab-test/new/master) and give it the name `license`, then attempt to select a template

#### app/assets/javascripts/blob/template_selector.js.es6 -> [diff](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6261/diffs#diff-8)
- This class is extended by the two previously mentioned files. As long as they work, this should work.

#### app/assets/javascripts/issues-bulk-assignment.js.es6 -> [diff](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6261/diffs#diff-11)
- [Visit issues](http://localhost:3000/gitlab-org/gitlab-test/issues), assign multiple issues a new label or milestone and update.

#### app/assets/javascripts/profile/gl_crop.js.es6 -> [diff](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6261/diffs#diff-12)
- [Visit your profile settings](http://localhost:3000/profile), upload a photo and attempt to crop and set as new profile picture.

#### app/assets/javascripts/profile/profile.js.es6 > [diff](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6261/diffs#diff-14)
- [Visit your profile settings](http://localhost:3000/profile), change various fields (Name, Bio, Email, Notifs settings) and submit form

#### app/assets/javascripts/todos.js.es6 -> [diff](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6261/diffs#diff-18)
- [Visit an issue](http://localhost:3000/documentcloud/underscore/issues/6) and Add Todo, then visit [Todos](http://localhost:3000/dashboard/todos). Try out the sorting features, making sure everything looks right. Mark the Todo done. 

#### app/assets/javascripts/user.js.es6 -> [diff](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6261/diffs#diff-19)
- [Visit user profile](http://localhost:3000/u/root) and click between tabs. 

#### app/assets/javascripts/user_tabs.js.es6 -> [diff](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6261/diffs#diff-20)
- Same as previous.

cc: @jschatz1

See merge request !6261

Fixes Pipeline list commit column width should be adjusted

## What does this MR do?
- Fixes some HTML problems
  - Pipeline and Build tables were inside an `ul` tag
  - Pipeline table had 2 `tbody` tags and no `thead`
- Adds grid classes in Pipeline table in order to be responsive: The content of the last column was being hidden but the column it self was not which results in a lot of blank space
- Adds a percentage width to the commit column in the Pipeline table.
- Removes one level of nesting in the commit column in the Pipeline table and to the Build column in the Build table.

## Are there points in the code the reviewer needs to double check?
No

## Why was this MR needed?
The commit column had to much white space.

## Screenshots (if relevant)
![pipelines](/uploads/d198f07dceb498cc7ec537842cd34fff/pipelines.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry 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
  - [ ] 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 you do - 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 #22509

See merge request !6595

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

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

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

Refactor Gitlab::Identifier

## What does this MR do?

This refactors `Gitlab::Identifier` so that it:

1. Has tests
2. Caches output in an instance variable to reduce queries
3. Uses only a single query to find a user by an SSH key, instead of 2

## Why was this MR needed?

This code was untested and would execute more SQL queries than needed.

See merge request !6680

(also clean up a few global refs)

This refactors Gitlab::Identifier so it uses fewer queries and is
actually tested. Queries are reduced by caching the output as well as
using 1 query (instead of 2) to find a user using an SSH key.

Update runner version only when updating contacted_at

## What does this MR do?

Improves how we update runners table, especially the version.

This is another round of improvements to reduce number of `ci_runners` updates.

I did make `contacted_at` to be updated more often (on average every 15 minutes).
We will also update version information in one go to solve: https://gitlab.com/gitlab-org/gitlab-ce/issues/22206

Improves: https://gitlab.com/gitlab-org/gitlab-ce/issues/22590
Solves: https://gitlab.com/gitlab-org/gitlab-ce/issues/22206

See merge request !6537