Delete a container registry asynchronously

Closes #51063 and #49926

See merge request gitlab-org/gitlab-ce!21553

Document git requirements for GIT_SUBMODULE_STRATEGY=recursive

Closes gitlab-runner#2992

See merge request gitlab-org/gitlab-ce!21563

Fix group labels page timeout if many projects and labels

Closes #51221

See merge request gitlab-org/gitlab-ce!21594

When a container registry has many tags, it's easy for the DELETE call to take more
than 60 seconds and fail. This can also leave the registry in a bad state with
null bytes since some of the images have been deleted with tags still pointing to them.
In addition, we have to prevent users from accidentally initiating the delete multiple
times or this could leave the registry with orphaned tags.

This commit also adds a flash message to notify the user the registry is scheduled
for deletion.

Closes #49926, #51063

Add new setting to Application Settings: receive_max_input_size

Closes #26044

See merge request gitlab-org/gitlab-ce!20758

Vertically centres landscape avatars those cannot fill up parent height.

See merge request gitlab-org/gitlab-ce!21371

Update ffi to 1.9.25

Closes #51180

See merge request gitlab-org/gitlab-ce!21561

If user has configure the setting then it will be passed to gitlab-shell
and gitlab-workhorse

Bump gitlab-shell to 8.2.1 to resolve HTTP status code handling

See merge request gitlab-org/gitlab-ce!21596

Add to CODEOWNERS for LDAP

See merge request gitlab-org/gitlab-ce!21600

Sort labels by reference

Closes #51241

See merge request gitlab-org/gitlab-ce!21601

CE port of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/7256

See merge request gitlab-org/gitlab-ce!21545

Labels are sorted by reference, not title. This caused random CI
failure.

Write diff highlighting cache upon MR creation (refactors caching)

Closes #50204

See merge request gitlab-org/gitlab-ce!21489

Remove orphaned label links and add a foreign key constraint

Closes gitlab-ee#7482

See merge request gitlab-org/gitlab-ce!21552

Include private contributions in user contribution graph

Closes #14078

See merge request gitlab-org/gitlab-ce!17296

On GitLab.com, there are over 2 million orphaned label links out of
a total of 13 million. These orphaned label links can cause
quiet failures, such as unexpected nil values in ExportCsvWorker.

Closes gitlab-org/gitlab-ee#7482

Ask user explicitly about usage stats agreement

Closes #48962

See merge request gitlab-org/gitlab-ce!21423

Resolve "Remove old storage logic from Import/Export"

Closes #51144, #50109, #48778, and #51079

See merge request gitlab-org/gitlab-ce!21409

Resolve "Wiki page attachments not rendered properly"

Closes #51196

See merge request gitlab-org/gitlab-ce!21572

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Replace whitespaces in wiki page attachments file names

Closes #51194

See merge request gitlab-org/gitlab-ce!21569

Send max_patch_bytes to Gitaly via Gitaly::CommitDiffRequest

Closes #50635

See merge request gitlab-org/gitlab-ce!21575

See https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/237 for more details.

Use ResourceLabelEvent for tracking label changes

Closes #48483

See merge request gitlab-org/gitlab-ce!21281

Port cleanup tasks to use Gitaly

Closes #40529 and gitaly#954

See merge request gitlab-org/gitlab-ce!21588

Encode remote root ref

See merge request gitlab-org/gitlab-ce!21583