Merge branch 'backstage/gb/migrations-tests-schema-version' into backstage/gb/migrate-stages-statuses

* backstage/gb/migrations-tests-schema-version:
  Migrate down before each migration unit test
  Disable db_cleaner tables caching in migrations tests
  Extend migrations testing documentation
  Make it possible to provide schema version in tests
  Migrate db schema for context in :migration specs

`migrate!` helper triggers a migration that is under the test, so we
need to revert it before each subsequent example. This means that we
need to place it in `before(:each, :migration)` hook.

We still want to migrate everything up *after* each *context*, so in
otherwords we need to place migrate up helper in `before(:context,
:migration)`.

* master: (1000 commits)
  Fix username autocomplete group name with no avatar alignment
  Fix 'Projected tags' typo in protected_tags_spec.rb
  Many Repo Fixes
  Repo Editor Fixes
  Docs: New index for permissions
  link article from CI index
  link tech articles from the landing page
  new articles come first
  fix relative link
  fix date format
  Fixed changed files dropdown not being shown
  Update publication date
  Remove deprecated field from workhorse API responses
  Fix API responses when dealing with txt files
  Make sure MySQL would not use CURRENT_TIMESTAMP
  Add two more project templates
  Allow usage of any_projects? with an Array
  Copyedit Artifactory and GitLab article
  Rename Artifactory and GitLab article file
  Display GPG status loading spinner only when Ajax request is made
  ...

Fix username autocomplete group name with no avatar alignment

Closes #36502

See merge request !13578

Fix 'Projected tags' typo in protected_tags_spec.rb

See merge request !13576

Make sure MySQL would not use CURRENT_TIMESTAMP as the default for timestamp columns

Closes #36405

See merge request !13560

Many Repo Fixes

See merge request !13432

Use border radius scss vars

See merge request !13360

Resolve "Tech article: Deploying Maven artifacts"

Closes #33329

See merge request !11955

Repo Editor Fixes

See merge request !13468

Docs: New index for permissions

Closes #32577

See merge request !13394

Fixed changed files dropdown not being shown

Closes #36479

See merge request !13554

Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ce into 33329-tech-article-deploying-maven-artifacts

Fix API responses when dealing with txt files

Closes #31790

See merge request !13474

Closes #36479

Remove deprecated field from workhorse API responses

See merge request !13567

Fix inconsistent spacing for edit buttons on issues and merge request page

Closes #36206

See merge request !13547

Resolve "Enable scope hoisting with webpack"

Closes #36152

See merge request !13374

Allow usage of any_projects? with an Array

Closes #3646

See merge request !13559

# Conflicts:
#   app/views/projects/merge_requests/_nav_btns.html.haml

Change Confidential Message When Visible - UI Polish

See merge request !13551