fix transient dropdown test failures

Closes #37052 and #34436

See merge request !13862

Instrument MergeRequest#ensure_ref_fetched

See merge request !13876

Reenable MySQL tests on all CE and EE branches part 2

Closes #36384

See merge request !13840

Don't wait for project authorization sidekiq jobs when creating projects

Closes #36792

See merge request !13775

Combine multiple expectations into one for shared system note example

See merge request !13814

Clear schema cache after running tests for migrations

Closes #37086

See merge request !13870

Remove skipped examples in filtered issues feature spec

See merge request !13845

Make sure we have an owner for triggers

Closes #35642

See merge request !13799

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

* upstream/master: (49 commits)
  Fire system hooks when a user is created via LDAP or OAuth
  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
  Docs: update - fix headers
  Handle creating a nested group on MySQL correctly
  Decrease statuses batch size even more in a migration
  Fix failure when issue author is nil
  Fix searching for files by path
  Fix invite by email address duplication
  Revert "Merge branch 'mk-reenable-mysql-tests-on-all-branches' into 'master'"
  Fix repo editor scrollbar
  Revert "Merge branch 'sh-sidekiq-backtrace' into 'master'"
  Replace 'source/search_code.feature' spinach test with an rspec analog
  Add missing third argument to `Git::Repository#initialize` in spec
  New doc: how to install GitLab on Azure
  Authorizations regarding OAuth - style confirmation
  Enable 5 lines of Sidekiq backtrace lines to aid in debugging
  Reenable MySQL tests on all branches
  ...

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

We perform a ton of expensive setup in this spec, via both `before` and
`let!`. When we use `skip` inside an `it` block, rather than skipping
the block entirely via `xit`, we still perform this expensive setup,
only to do absolutely nothing with it, resulting in wasted time.
Minutes, in this case.

Further, these specs have been sitting in our test suite for about seven
months now, so the likelihood of them being addressed soon seems low.

Fix repo editor scrollbar

Closes #37020

See merge request !13823

Common Docker Documentation Location in `gitlab-ce`

Closes #36828

See merge request !13749

To protect master from surprise failures, as long as we continue to support MySQL.

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

Only admins have the ability to create a project in another user's personal
namespace. Prior to this commit, we were explicitly adding them as masters to
the project. However, admins already have access (by virture of being admins),
so this is unnecessary.

Docs update links guideline to inline links

Closes gitlab-com/gitlab-docs#121

See merge request !13677

If the project is in a group, the `group.refresh_members_authorized_projects`
is made non-blocking, and we call `current_user.refresh_authorized_projects`
directly.

Projects in a personal namespace are more difficult. Rather than passing the
`blocking:` parameter through the entire `add_master` chain, have the
`AuthorizedProjectsWorker` automatically inline authorizations for three IDs or
less. Since the maximum number of IDs in this path is 2, that has the same effect.