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

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

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

This test takes too long and leads to flakiness so we disable it for now until somebody can figure out why it takes longer than 20 minutes to finish.

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