In order to check whether certain operations are allowed to be executed
by a user, Gitaly POSTs to the `/internal/allowed` endpoint. The request
includes information about what change the user wants to perform, but it
also contains information about the environment the change is currently
performed in.

When a user performs a push, git will first store all pushed objects
into a quarantine environment. This is a separate temporary directory
containing all new objects such that if the push gets rejected, new
objects will not persist in the repository. The crux is that in order to
inspect these new objects, git needs to be told that such a quarantine
environment exists. This is why Gitaly sends information about this
quarantine environment to `/internal/allowed`, so that we can again
relay this information back to Gitaly when we want to inspect newly
pushed objects to determine whether they're allowed or not.

While it's a leaky abstraction, it has worked fine until now. But with
transactions, that's not true anymore: when multiple Gitaly nodes take
part in a push, then they'll all generate a randomly named quarantine
environment. But as only the primary node will inject its info into the
request, we are not able to acces quarantine environments of secondary
nodes. If we now route accessor requests to any of the secondary Gitaly
nodes with the quarantine environment of the primary, then the request
will fail as git cannot find quarantined objects.

To fix this, Gitaly has recently grown a new GRPC header which allows us
to force-route requests to the primary via 1102b0b67 (praefect:
Implement force-routing to primary for node-manager router, 2021-02-03)
and 4d877d7d5 (praefect: Implement force-routing to primary for per-repo
router, 2021-02-03). So let's set that header if we know that we're
being executed via a hook, which is the only case where a quarantine
environment may exist.

Resolve "[Jobs empty state] Successful Cleanup" [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!53240

Revert '290944-pull-by-digest' and cleanup bad records

See merge request gitlab-org/gitlab!53506

Send only latest jobs in pipeline webhook payload

See merge request gitlab-org/gitlab!53159

Debian Publications

See merge request gitlab-org/gitlab!52916

Reduce duplication of QA custom matchers

See merge request gitlab-org/gitlab!52721

Merge branch '300913-refactor-group_sso-and-group_managed_account-entity-properties-to-use-presenter' into 'master'

Refactor member entity properties to use presenter

See merge request gitlab-org/gitlab!53276

Also hint that dev pipelines should be checked

See merge request gitlab-org/gitlab!53452

Fail Dangerbot if metrics dictionary.md is not updated

See merge request gitlab-org/gitlab!53397

Merge branch '301209-post-an-information-message-about-automatic-update-of-mr-title-when-the-mr-adds-removes-a' into 'master'

Post an information message about automatic update of MR title when the MR adds/removes a feature flag [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!53513

Use all_changed_files

Rubocop:disable Style/SignalException

Signed-off-by: Rémy Coutable <remy@rymai.me>

Update codeowners with docs directories

See merge request gitlab-org/gitlab!53569

As many directories to make sure the correct TWs are
pinged by GitLab bot on community contributions

Add custom scanners to vulnerability list scanner filter [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!49710

Add custom scanners to scanner filter dropdown on vulnerability report

Add btn-default to buttons in todos page

See merge request gitlab-org/gitlab!53348

Add subscriptions endpoint

See merge request gitlab-org/gitlab!53184

docs: Add SAST analyzer section on post analyzers

See merge request gitlab-org/gitlab!53505

Unchecked mark was not rendering on windows

See merge request gitlab-org/gitlab!53349

[RUN ALL RSPEC] Update grape gem to 1.5.2

See merge request gitlab-org/gitlab!53547

Cleanup onboarding issues experiment [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!52905

Route alert management docs urls to helpful locations

See merge request gitlab-org/gitlab!51665

Remove unused methods

See merge request gitlab-org/gitlab!53520

Fixes Ruby 2.7 warnings

CHANGELOG:
https://github.com/ruby-grape/grape/blob/master/CHANGELOG.md

Update dependency @gitlab/ui to v27.4.6

See merge request gitlab-org/gitlab!53503

Fix eslint error to make the master green

See merge request gitlab-org/gitlab!53543

Remove the project label from histogram metrics

See merge request gitlab-org/gitlab!53496

Fix "Stay on Page" alert showing in empty snippet

See merge request gitlab-org/gitlab!50400

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/50400

Remove fuzzy search for emoji

See merge request gitlab-org/gitlab!51972