Add a custom RSpec/SingleLineHook cop

Closes #24891

See merge request !11911

This cop adds an offense when `before`, `after`, or `around` are used as
single-line blocks.

Fix fenced code block misalignment in events/activity

Closes #31263

See merge request !12149

Add codeclimate job to .gitlab-ci.yml

See merge request !12086

more visual contrast for active page in pagination widget

Closes #32470

See merge request !12119

Allow more customization to Help landing page

See merge request !11878

Implement diff viewers

Closes #30501 and #19931

See merge request !11777

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

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

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

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

Backport EE changes to the Kubernetes service

Closes gitlab-ee#2525

See merge request !12139

Fix raw_path with the new job path, rename builds to jobs in test

Closes #33149

See merge request !11941

Raise etag route regex miss

Closes #33106

See merge request !12084

Move vue components to vue files and match docs

See merge request !12146

Fix Markdown in JIRA integration docs

See merge request !12160

Adds back whitespace for job's trace

Closes #33639

See merge request !12142

Backport empty panel heading from EE related issues

See merge request !12153

Backport issue count badge style refactor for re-use from EE related issues

See merge request !12152

Fix wrong link to codeclimate diff docs

See merge request !12158

Add docs for personal access tokens

Closes #31740 and #33261

See merge request !12128

* upstream/master: (34 commits)
  Revert "Merge branch 'karma-headless-chrome' into 'master'"
  Make small pipeline schedules UI enhancements.
  Remove js classes from vue component that are not needed in vue component
  Update tests and application
  Adds "Pipeline" to job's sidebar
  Change border color of job's scroll controllers to $border-color
  Add database helpers 'add_timestamps_with_timezone' and 'timestamps_with_timezone'
  Added Tectonic to the page.
  Always check read_issue permissions when loading issue
  Handle legacy jobs without name
  Do not expose internal artifacts hash in build entity
  Use wait_for_requests instead of sleep 0.3
  Limit wiki container width
  Fix migrations testing support RSpec hooks order
  Rename BuildEntity to JobEntity
  Fix support for external_url for commit statuses
  Allow to access pipelines even if they are disabled, but only present jobs and commit statuses without giving ability to access them
  add CHANGELOG.md entry for !12036
  remove phantomjs-specific test hacks
  update karma job to use chrome build image created by gitlab-build-images!41
  ...

Add support for services configuration in .gitlab-ci.yml

See merge request !8578

Allow to access statuses for external CI services

Closes #30714, #29369, and #15220

See merge request !11176

See
https://gitlab.com/gitlab-org/gitlab-ee/commit/4b5a1c9a6570d70cd3e16b3c1d3c2ec0471f46eb#777d5694836def44d2a73f1c7590aea20aed6c22_35_35

From MR: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1797/

Added by
https://gitlab.com/gitlab-org/gitlab-ee/commit/88aea2cbc8633ba970335d935d725bd17654b424

Part of this MR: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1797/