Adds tests

* master: (525 commits)
  Introduce "polling_interval_multiplier" as application setting
  fix spelling CI_REPOSITORY_URL (line:355) gitab-ci-token to gitlab-ci-token.
  Pass Gitaly Repository messages to workhorse
  Use gitaly 0.5.0
  Fix specs
  Improve specs examples
  Minor refactor
  Fix BrachFormatter for removed users
  Changelog
  Fix specs
  One more change to the branch names to preserve metadata
  Prefixes source branch name with short SHA to avoid collision
  Fix GitHub importer for PRs of deleted forked repositories
  Change order of specs
  Clean history after every test that changes history
  Clean history state after each test
  Fixes method not replacing URL parameters correctly
  Fix a transient failure caused by FFaker
  Remove unnecessary ORDER BY clause when updating todos
  Add a wait_for_ajax call to ensure Todos page cleans up properly
  ...

#22303 fix mode representation git::tree ( in base 8 )

Closes #22303

See merge request !9780

fix spelling CI_REPOSITORY_URL (line:355) gitab-ci-token to gitlab-ci-token.

See merge request !10409

Introduce "polling_interval_multiplier" as application setting

Closes #29759

See merge request !10280

Pass Gitaly 'Repository' messages to workhorse for Git HTTP

Closes gitaly#148

See merge request !10343

Fix GitHub importer for PRs of deleted forked repositories

Closes #29541

See merge request !9992

Fix race condition where a namespace would be deleted before a project was deleted

Closes #30334 and #30306

See merge request !10389

Fix a few N+1 queries identified by Bullet

See merge request !10361

Fix warning when trying to clone repo that already existed

See merge request !10367

Implement module for setting "Poll-Interval" response header.
Return 429 in ETag caching middleware when polling is disabled.

Fix a transient failure caused by FFaker

Closes #30211

See merge request !10404

Relax constraint on Wiki IDs, since subdirectories can contain spaces

Closes #30357

See merge request !10396

Add a wait_for_ajax call to ensure Todos page cleans up properly

See merge request !10398

Fixes method not replacing URL parameters correctly

Closes #30264

See merge request !10351

Fix redirection after login when the referer have params

Closes #29669

See merge request !10397

Remove unnecessary ORDER BY clause when updating todos

See merge request !10399

The error occurs when the Ffaker-generate title or description of
issue3 contains git, e.g. fugit in this case.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Use gitaly commit is ancestor

See merge request !9864

Fix N+1 query in loading pipelines in merge requests

See merge request !10363

Potentially fixes intermittent failures such as https://gitlab.com/gitlab-org/gitlab-ce/builds/13484375