synchronize CHAGELOG.md with the CE master

Closes #3001

See merge request !2512

Upgrade haml_lint Gem to 0.26.0

See merge request !2601

Trial and license purchases inside GitLab EE

Closes #2500

See merge request !2266

Add Billings page to users profile and group admin

Closes #2344

See merge request !2603

Show add badge only when user can manage Related Issues

Closes #3080 and #3069

See merge request !2583

33095 mr widget ui ee

See merge request !2389

Ensure artifacts are moved locally within the filesystem to prevent timeouts

Closes #3068

See merge request !2572

CE upstream: Thursday

Closes gitaly#415, gitlab-ce#35592, gitaly#398, and #2604

See merge request !2589

checking against if it's responding to environment_scope
directly. See:

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12936#note_36822301

Refactor.notification recipient builders (ee version)

See merge request !2584

See https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2589#note_36815441

We need to fix this properly in the future

* ee/master:
  Add notes on when repository pulling and pushing where introduced in GitLab
  fixed specs
  EE port of 34060-simplified-general-project-settings
  Backport to CE for:
  Make new dropdown dividers full width
  Update EE doc about where to place the files
  Update JavaScript style guide according to:
  Handle project deletions in Geo::LogCursor
  Fix json schema definition
  Move the new files
  35659 Rename Pipelines tab to CI / CD in new navigation
  Move this spec to the right location and enable rubocop
  Move javascript files
  Move the new view files
  Move spec files
  Move views
  Also move models/concerns and lib
  Move EE-specific files to a standalone directory

EE port of 34060-simplified-general-project-settings

See merge request !2556

Add notes on when repository pulling and pushing where introduced in GitLab

See merge request !2607

Make new dropdown dividers full width

See merge request !2600

https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2589#note_36800452

EE: CE: Move EE-specific files to a standalone directory

See merge request !2604

Handle project deletions in Geo::LogCursor

See merge request !2452

EE port 35659 Rename Pipelines tab to CI / CD in new navigation

See merge request !2582

https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2483

Move EE-specific files to a standalone directory

Closes #2902

See merge request !2483