Fix QA builds failing due to change in new project page behavior

Closes gitlab-qa#322

See merge request gitlab-org/gitlab-ce!21621

Add system note when due date is changed

Closes #38208

See merge request gitlab-org/gitlab-ce!21628

Update invite_group_spec to be consistent with EE

See merge request gitlab-org/gitlab-ce!21608

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21386 re-introduced
the explicit creation of the project name separate from the project path.
Filling in the name does automatically populate the path, but the reverse
is not true. We now fill in the name instead of the path.

Closes https://gitlab.com/gitlab-org/gitlab-qa/issues/322

Resolve "Remove Gitlab::GitAccess#authed_via_jwt?"

Closes #51267

See merge request gitlab-org/gitlab-ce!21610

If one spec disables the usage ping in the in-memory application settings
(e.g. spec/features/usage_stats_consent_spec.rb), then this spec will
fail. To work around this problem, we enable the usage ping explicitly
in the setup phase.

Backport of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/7290

Resolve "Merge requests show outdated discussions on changes tab"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

Previously overridden in EE but no longer required.

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

The check for the "Invite member" tab for the test
where a project cannot be shared with groups isn't
relevant, and needs to be removed since in EE the
visibility rules for the tab are different due to
both the group and membership lock capabilities.

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