Allow project owners to set up forking relation through API

Closes #40550

See merge request gitlab-org/gitlab-ce!18104

Resolve "Separate remembering sorting issues/merge requests"

Closes #49993

See merge request gitlab-org/gitlab-ce!21153

Backport of gitlab-org/gitlab-ee!6876

See merge request gitlab-org/gitlab-ce!21266

Resolve "[QA] Automation Triage 11.1.0 RC9 - Filling textarea with deploy key timeouts sometime"

Closes #49179

See merge request gitlab-org/gitlab-ce!21258

Add JIRA service specs to commit object

See merge request gitlab-org/gitlab-ce!21116

Resolve "Wiki: links with spaces in the url render incorrectly with CommonMark"

See merge request gitlab-org/gitlab-ce!20417

Resolve "Fix bad test from 20765 MR"

Closes #50323

See merge request gitlab-org/gitlab-ce!21219

[QA] Improve the fork scenario to take a username and password instead of always…

Closes gitlab-org/quality/staging#2

See merge request gitlab-org/gitlab-ce!21090

Port of ccr/6274/add_weight_to_payload to CE

See merge request gitlab-org/gitlab-ce!21315

Add authenticate to events api. fix #49255

Closes #49255

See merge request gitlab-org/gitlab-ce!20627

fix broken pathing (remove extraneous ../)

See merge request gitlab-org/gitlab-ce!21318

Resolve "UX bug in CI Runner settings on projects with many runners"

Closes #42754

See merge request gitlab-org/gitlab-ce!21314

Resolve "Job page illustration overflows on mobile"

Closes #48145

See merge request gitlab-org/gitlab-ce!21313

Resolve "Remove redundant header from metrics page"

Closes #50019

See merge request gitlab-org/gitlab-ce!21282

add initial smoke tests and documentation

See merge request gitlab-org/gitlab-ce!20568

Remove Gemnasium service

See merge request gitlab-org/gitlab-ce!21185

Includes settings hash on runners pagination links

use nfs4 mount to match other docs

See merge request gitlab-org/gitlab-ce!21270

#47845 - Propagate failure_reason to job webhook

See merge request gitlab-org/gitlab-ce!21143

Disable code_quality check in auto devops QA integration test

See merge request gitlab-org/gitlab-ce!21304

Refactor AutocompleteController

See merge request gitlab-org/gitlab-ce!20908

clarify runners currently online text

See merge request gitlab-org/gitlab-ce!21151

A forked project stores its LFS objects in the `forked_from_project`.
So the LFS objects become inaccessible, and therefore delete them from
the database so they'll get cleaned up.

To be refactored when implementing
https://gitlab.com/gitlab-org/gitlab-ce/issues/39769

Before this change only GitLab admins where allowed to set up forking
relation through the API. This changes that so project owners can
do this too.

Closes gitlab-org/gitlab-ce#40550.

This refactors the AutocompleteController according to the guidelines
and boundaries discussed in
https://gitlab.com/gitlab-org/gitlab-ce/issues/49653. Specifically,
ActiveRecord logic is moved to different finders, which are then used in
the controller. View logic in turn is moved to presenters, instead of
directly using ActiveRecord's "to_json" method.

The finder MoveToProjectFinder is also adjusted according to the
abstraction guidelines and boundaries, resulting in a much more simple
finder.

By using finders (and other abstractions) more actively, we can push a
lot of logic out of the controller. We also remove the need for various
"before_action" hooks, though this could be achieved without using
finders as well.

The various finders related to AutcompleteController have also been
moved into a namespace. This removes the need for calling everything
"AutocompleteSmurfFinder", instead you can use
"Autocomplete::SmurfFinder".

Update CONTRIBUTING.md

See merge request gitlab-org/gitlab-ce!21286

Update README.md

See merge request gitlab-org/gitlab-ce!21285

Fix code quality reports

See merge request gitlab-org/gitlab-ce!21275