Reintroduce coverage report for JavaScript

Closes #27826 and #20757

See merge request !9133

Replace static fixture for behaviors/requires_input_spec.js

See merge request !9162

Replace NPM with Yarn

See merge request !9055

Enable eslint to resolve webpack modules according to webpack.config.js

See merge request !9218

Replace static fixture for right_sidebar_spec.js

See merge request !9211

Document types of pipelines

Closes #22631

See merge request !9008

Resolve "Wiki page delete does not trigger the webhook"

Closes #19302

See merge request !8198

API: consolidate project lists

Closes #23061

See merge request !8962

Update doc for enabling or disabling GitLab CI

Closes #27656

See merge request !8965

Add 'Most Recent Activity' header to User Profile

Closes #26286

See merge request !9189

Use es6-promise package to avoid webpack warnings

See merge request !9215

Adds `.json` to the endpoint requested in order to avoid showing JSON

Closes #27932

See merge request !9105

Set max width for text in mini pipeline graph

Closes #27924

See merge request !9188

Remove inactive default email services

See merge request !8987

It consolidates these endpoints:
 - /projects
 - /projects/owned
 - /projects/visible
 - /projects/starred
 - /projects/all

Into the /projects endpoint using query parameters.

Add MySQL info in install requirements

See merge request !9230

[ci skip]

Feedback:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8987#note_22938402

This reverts commit f2ed7cbc9b36b6ad9bcc714b271e98ead756b816.

This way we could reuse this pool for other migrations

Feedback:

* https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8987#note_22923350
* https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8987#note_22923365

by ourselves so that even if the setting has 1 connection
we could still use more connections.

Note that we no longer generate this by default.
This is for clearing legacy default data.

Introduce Gitlab::Database.with_connection_pool

See merge request !9192

Move /projects/fork/:id to /projects/:id/fork in V4 API

Closes #14492

See merge request !8940

Fix ActiveRecord connection leaks

Closes #27949 and gitlab-com/infrastructure#1139

See merge request !9109

Add discussion events to contributions calendar

Closes #22645

See merge request !8821

Display loading indicator when filtering ref switcher dropdown

Closes #27966

See merge request !9144

Add omniauth-oauth2-generic strategy

Closes #26744

See merge request !9048

Add GFM support to nested groups

See merge request !9184