Resolve "Merge requests show outdated discussions on changes tab"

Closes #48167

See merge request gitlab-org/gitlab-ce!21543

Fix scoping errors occuring for ContainerRepository on some builds

See merge request gitlab-org/gitlab-ce!21612

Resolve "Create new project: Re-add project name field"

Closes #2934

See merge request gitlab-org/gitlab-ce!21386

Bump gitlab-shell to 8.3.0

See merge request gitlab-org/gitlab-ce!21607

Resolve "Process urls with spaces in all markdown processing"

Closes #51233

See merge request gitlab-org/gitlab-ce!21602

Vue MR Page - Data structure update

See merge request gitlab-org/gitlab-ce!21062

Use gitlab-ui modal wrapped component

See merge request gitlab-org/gitlab-ce!21171

Add Documentation Dangerfile

See merge request gitlab-org/gitlab-ce!21395

Add guidance on using colons in bullet lists, and make styleguide adhere closer to styleguide.

Closes #51086

See merge request gitlab-org/gitlab-ce!21549

Provide a cached archive of compiled assets

See merge request gitlab-org/gitlab-ce!21078

Document how to specify environment variables during manual pipeline run and more

Closes #46364

See merge request gitlab-org/gitlab-ce!21548

Forward build image to use Chrome 69

Closes #50527

See merge request gitlab-org/gitlab-ce!21586

Adds documentation for 'Automatically disable Auto DevOps for project upon first pipeline failure'

See merge request gitlab-org/gitlab-ce!21226

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.