Simplify system hook testing and guarantee test will fire

Closes #37067

See merge request !13858

Bugfix.notify custom participants

Closes #36610

See merge request !13680

Update 'Using Docker images' documentation

Closes gitlab-ci-multi-runner#2696

See merge request !13848

Rename CI/CD related Sidekiq queues

Closes #35532

See merge request !13714

Remove 'dependent: :destroy' from ProtectedRef has_many :"#{type}_access_levels"

See merge request !13835

The change in !11728 would cause an arbitrary project to be chosen to test
system hooks, and it's likely that the project would not have any commits or
relevant commits to test the hook. This would prevent admins from verifying
that the hook fired. Instead of trying to create a representative hook
dynamically, just send static data to guarantee the hook will actually be
tested.

Closes #37067

Fire system hooks when a user is created via LDAP or OAuth

Closes #37073

See merge request !13846

Merge commit '2be34630' into backstage/gb/rename-ci-cd-processing-sidekiq-queues

* commit '2be34630':
  Common Docker Documentation Location in `gitlab-ce`
  fix deprecation warning present during webpack compiles
  Enable 5 lines of Sidekiq backtrace lines to aid in debugging
  Add support for copying permalink to notes via more actions dropdown
  Handle creating a nested group on MySQL correctly
  Decrease statuses batch size even more in a migration
  Fix repo editor scrollbar
  Replace 'source/search_code.feature' spinach test with an rspec analog
  Authorizations regarding OAuth - style confirmation
  Update README.md
  Refactor complicated API group finding rules into GroupsFinder
  Fix group and project search for anonymous users
  Document version Group Milestones API introduced
  Allow v4 API GET requests for groups to be unauthenticated
  Adjust a range and a size in stages statuses migration
  Update README.md
  Point to /developers on docs/administration/authentiq.md
  Indexes GFM markdown guide
  use inline links instead of referenced
  Add index on ci_runners.contacted_at

Closes #37073

Fix repo editor scrollbar

Closes #37020

See merge request !13823

Common Docker Documentation Location in `gitlab-ce`

Closes #36828

See merge request !13749

Improve documentation for 'dependencies' keyword

Closes #36857

See merge request !13758

Enable 5 lines of Sidekiq backtrace lines to aid in debugging

Closes #27626

See merge request !13822

Document version Group Milestones API introduced

See merge request !13787

Fix deprecation warning when running webpack

See merge request !13656

Point to /developers on docs/administration/authentiq.md

See merge request !13710

Replace 'source/search_code.feature' spinach test with an rspec analog

See merge request !13697

Docs update links guideline to inline links

Closes gitlab-com/gitlab-docs#121

See merge request !13677

Add deprecation note in renaming sections for CI_BUILD_* variables

Closes #36973

See merge request !13801

Handle creating a nested group on MySQL correctly

See merge request !13829

Authorizations regarding OAuth - style confirmation

Closes #35721

See merge request !13691

Customers often have Sidekiq jobs that failed without much context. Without
Sentry, there's no way to tell where these exceptions were hit. Adding
in additional lines adds a bit more Redis storage overhead. This commit
adds in backtrace logging for workers that delete groups/projects and
import/export projects.

Closes #27626

Fix group and project search for anonymous users

Closes #31409

See merge request !13745

Add support for copying permalink to notes via more actions dropdown

Closes #35811

See merge request !13299

Adjust a range and a batch sizes in stages statuses migration

Closes #36793

See merge request !13767

# Conflicts:
#   db/schema.rb

Fix failure when issue author is nil

See merge request !13807

Docs: update - fix headers

See merge request !13819

Since we don't support nested groups on MySQL, raise an error
explaining that on import instead of trying anyway.

Fix searching for files by path

Closes #36939

See merge request !13798

Remove leftover API helper for removed CI API

See merge request !13804

Re-allow appearances.description_html to be NULL

Closes #36919

See merge request !13806