Refactor AutocompleteController

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

clarify runners currently online text

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

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

Merge branch '49907-commits-and-merge-requests-does-not-list-all-files-when-one-file-exceeds-size-limits' into 'master'

Resolve "Commits and Merge Requests does not list all files when one file exceeds size limits"

Closes #49907

See merge request gitlab-org/gitlab-ce!21125

Remove duplicate nip.io link

See merge request gitlab-org/gitlab-ce!20457

Document Interactive web terminals for CI/CD jobs

See merge request gitlab-org/gitlab-ce!20719

format doc/ reference

See merge request gitlab-org/gitlab-ce!21149

fix hashed storage readiness link

See merge request gitlab-org/gitlab-ce!21150

Fix typo

See merge request gitlab-org/gitlab-ce!21293

Remove more variable reassignments and unused styles

See merge request gitlab-org/gitlab-ce!21262

Add documentation about reading query plans

See merge request gitlab-org/gitlab-ce!21199

Blacklist the use of destroy_all

See merge request gitlab-org/gitlab-ce!21250

GitHub importer: Keep track of internal_ids

Closes #49754

See merge request gitlab-org/gitlab-ce!20926

replace nobootwait with nofail

See merge request gitlab-org/gitlab-ce!21269

Bump Gitaly to 0.117.1 for Rouge update

See merge request gitlab-org/gitlab-ce!21277

This adds a database guide on how to read the output of "EXPLAIN" and
"EXPLAIN ANALYZE", and how to use this output to understand a query's
performance and optimise it.

Fix SiteStatistics wikis_count

See merge request gitlab-org/gitlab-ce!21030

Mention how to override CE class methods

See merge request gitlab-org/gitlab-ce!21276

Creates vue components for stage dropdowns and job list container for job log view

See merge request gitlab-org/gitlab-ce!21255

Resolve "Project deletion may not log audit events during user deletion"

Closes #49796

See merge request gitlab-org/gitlab-ce!21248

Remove some duplicate tests and fix some typos

See merge request gitlab-org/gitlab-ce!21246

See https://gitlab.com/gitlab-org/gitlab-ce/issues/49446.

Remove feature flags for UserUpdateBranch

Closes gitaly#1246 and gitaly#1310

See merge request gitlab-org/gitlab-ce!21238

Fixed Web IDE live preview crashing when loading from merge request

Closes #50392

See merge request gitlab-org/gitlab-ce!21252

Fix mirror settings anchor

See merge request gitlab-org/gitlab-ce!21261

Creates Vue component for commit block in job log view

See merge request gitlab-org/gitlab-ce!21249

Creates Vue component for trigger variables block in job log page

See merge request gitlab-org/gitlab-ce!21244