* master: (104 commits)
  Update licenses
  fix a wrong method call in the refactor
  fix a whitespace
  fix for discussion
  Update templates via:
  Update doc accordingly to:
  Cache issuable template names
  Fix the format of rugged alternate directory list
  Match full file path in FileDetector
  Fixes from CSS refactor
  Resolve "Prometheus service page shows error"
  Explicit state integration deletion
  Move all API authentication code to APIGuard
  Shorten example translation for inclusive language
  [ci-skip] add changelog
  fix the merger override to remove source branch
  add spec
  Removed d3.js  from the users and graphs bundle
  Cleanup data-page attribute after each Karma test
  Update template description wording
  ...

Update dependencies license list

See merge request gitlab-org/gitlab-ce!14845

Fix the format of rugged alternate directory list

Closes #39046

See merge request gitlab-org/gitlab-ce!14840

Resolve "remove source branch" checkbox from merge widget being ignored

Closes #34897

See merge request gitlab-org/gitlab-ce!14832

Update installation doc for 10.1

See merge request gitlab-org/gitlab-ce!14843

Add `Gitlab::Git::Repository#fetch` command

Closes gitaly#586

See merge request gitlab-org/gitlab-ce!14772

fix multiple notifications from being sent for multiple labels

Closes #37691

See merge request gitlab-org/gitlab-ce!14798

Update templates

See merge request gitlab-org/gitlab-ce!14844

Followed the command from
https://gitlab.com/gitlab-org/release-tools/blob/master/doc/release-candidates.md#step-4-update-the-dependencies-license-list

    bin/bundle exec license_finder report --format=csv
--save=vendor/licenses.csv

Cache issuable template names

See merge request gitlab-org/gitlab-ce!14823

    bin/rake gitlab:update_templates

https://gitlab.com/gitlab-org/release-tools/blob/master/doc/release-candidates.md#creating-rc1

We were looking these up on each request to an issue page, because the form is
pre-filled, as is the template dropdown. That was unnecessary: we could just
treat these as 'special' repository files (like the rendered README) and cache
them in Redis until they change on a push.

Fixes #39046

Move all API authentication code to APIGuard

See merge request gitlab-org/gitlab-ce!14528

The basename appears to have been a holdover from the past - it doesn't look
necessary now. Some of the regexes were unanchored on one side, so explicitly
ensure that they only match the root.

Apart from that, this means that pushing to foo/README.md will no longer
invalidate the main README cache for a project.

Fixes from CSS refactor

Closes #39001 and #38939

See merge request gitlab-org/gitlab-ce!14828

Resolve "Prometheus service page shows error"

Closes #35652

See merge request gitlab-org/gitlab-ce!14771

Shorten example translation for inclusive language

See merge request gitlab-org/gitlab-ce!14833

Add docs for GKE integration

See merge request gitlab-org/gitlab-ce!14712

Fix a missing link and create a separate "Testing guides" section

See merge request gitlab-org/gitlab-ce!14819