Update templates to include header in the README

Closes #36904

See merge request !13785

[ci skip]

Fix a transient failure in mini_pipeline_graph_spec

Closes #34323

See merge request !13844

Add filtered search to group merge requests dashboard

Closes #36703

See merge request !13688

Add spec for deleting protected tags

See merge request !13693

Fix events error importing GitLab projects

Closes #36965

See merge request !13868

This spec failed reliably with a specific run order (see issue), the
reasons for which are still unknown. This simplification resolves the
failure.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/34323

Improve flaky ACE editor spec

See merge request !13854

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