`Rugged::Reference.valid_name?` used in
`Gitlab::GitRefValidator.validate` fails on strings containing null
bytes because it uses `StringValueCStr()`. Per
https://silverhammermba.github.io/emberb/c/:

Ruby’s String kinda corresponds to C’s char*. The simplest macro is
StringValueCStr() which returns a null-terminated char* for a
String. The problem here is that a Ruby String might contain nulls - in
which case StringValueCStr() will raise an ArgumentError!

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/54466

Fix deadlock on ChunkedIO

See merge request gitlab-org/gitlab-ce!23329

Rails 5 deprecation: Passing an argument to force an association to reload is now deprecated

See merge request gitlab-org/gitlab-ce!23337

Allow profiler to authenticate by stubbing users directly

Closes #54327

See merge request gitlab-org/gitlab-ce!23320

Backport of gitlab-ee!8470

See merge request gitlab-org/gitlab-ce!23150

Add events index on project_id and created_at

Closes #53992

See merge request gitlab-org/gitlab-ce!23354

Upgrade better_errors gem to 2.5.0

See merge request gitlab-org/gitlab-ce!23312

Fix Image Lazy Loader for some older browsers

Closes #54407

See merge request gitlab-org/gitlab-ce!23349

Override CI_COMMIT_REF_SLUG for QA branches

See merge request gitlab-org/gitlab-ce!23346

CE port of "Move merge request approval settings"

See merge request gitlab-org/gitlab-ce!23157

The `gitlab:assets:compile` job isn't run for the QA branches, thus
there's no Docker image correspinding these branches in the registry.

By overriding `CI_COMMIT_REF_SLUG` to `master` for QA branches, the
`fetch-assets` job in the `omnibus-gitlab` pipeline will pull the
`master` assets Docker image.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Update externalized strings from `/app/views/project/runners`

See merge request gitlab-org/gitlab-ce!23347

i18n: externalize strings from 'app/views/shared/members'

See merge request gitlab-org/gitlab-ce!23125

Some older browsers do not ship with isIntersecting, while they already
have IntersectionObserver support. We make use of `intersectionRatio`
now to fix the Lazy Loader for those browsers.

Batch load only data from same repository when lazy object is accessed

See merge request gitlab-org/gitlab-ce!23309

Signed-off-by: Tao Wang <twang2218@gmail.com>
Signed-off-by: Rémy Coutable <remy@rymai.me>

Cache project HEAD to prevent unnecessary Gitaly calls

See merge request gitlab-org/gitlab-ce!23307

Allow to store null variables

Closes #54379

See merge request gitlab-org/gitlab-ce!23299

CE Backport: Extract Gitlab::Prometheus::QueryVariables

See merge request gitlab-org/gitlab-ce!23335

Refactor issue boards switcher to single file Vue component (CE-port)

See merge request gitlab-org/gitlab-ce!23274

CE port for qa-193-ldap-group-sync EE branch

See merge request gitlab-org/gitlab-ce!22834

Previously, we used a personal access token. This had a couple of
problems:

1. If the user didn't have a PAT, we couldn't impersonate them.
2. It depended on reading the raw PAT from the database.

Instead, we can monkey-patch the authentication methods on
ApplicationController (overriding the Devise ones), and remove them once
we're done. This does mean that profiles will not profile auth
correctly, so for that, use a PAT directly.

Add @vue/test-utils as dev dependency

See merge request gitlab-org/gitlab-ce!23345

By specifying `key`, we get a different lazy batch loader for each
repository, which means that accessing a lazy object from one repository
will only result in that repository's objects being fetched, not those
of other repositories, saving us some unnecessary Gitaly lookups.

Externalize strings from `/app/views/project/runners`

See merge request gitlab-org/gitlab-ce!23208

Exclude qa-frontend from running on docs-only branches

See merge request gitlab-org/gitlab-ce!23327

Instruct against squashing in CE to EE MRs

See merge request gitlab-org/gitlab-ce!23330

Attempt to fix lazy loader spec transient failure

Closes #49511

See merge request gitlab-org/gitlab-ce!22918

Fix documentation on using prettier for a specific directory

See merge request gitlab-org/gitlab-ce!23336