Use Namespace#full_path instead of #path where appropriate

See merge request !9495

Simplify variables validation in triggers API

See merge request !9506

Use correct GitLab Prometheus exporter name in docs

Closes #28619

See merge request !9503

Added application password instructions for Gmail/G suite accounts

See merge request !9486

Fix broken links in CI admin area docs

See merge request !9507

clarify Pages custom domain details

Closes #28577

See merge request !9457

Api remove owned groups

Closes #27937

See merge request !9505

Use persistent name identifier instead of transient in SAML2 documentation

Closes #28653

See merge request !9504

[ci skip]

# Conflicts:
#   doc/api/v3_to_v4.md

Return 202 with JSON body on async removals on V4 API

Closes #3874

See merge request !9449

Artifact Expiration Defaults

Closes #27762

See merge request !9219

Fixed instructions for adding Secret Variables to a CI/CD pipeline.

See merge request !9480

fixes job dropdown action button error

Closes #27530

See merge request !9182

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9219#note_24032923

* upstream/master: (247 commits)
  Switched CONTRIBUTING.md style guide recommendation for method chaining
  Fix new offenses
  Stylistic tweaks
  Fix OAuth/SAML user blocking behavior
  Revert "Enable Style/DotPosition"
  Revert "Prefer leading style for Style/DotPosition"
  Revert "Enable Style/BarePercentLiterals"
  Manually correct autocorrect
  Move up delegate calls
  Exclude migrations from Style/MutableConstant
  ActiveSupport delegation is preferred over Forwardable
  Update haml_lint to work with newest rubocop
  Add explanations to cops
  Update rubocop and rubocop-rspec and regenerate .rubocop_todo.yml
  Update rubocop and rubocop-rspec and regenerate .rubocop_todo.yml
  Order cops alphabetically
  Don’t exclude some file in lib from rubocop
  Fix new offenses
  Enable Rails/Delegate
  Enable Style/WordArray
  ...

Create master branch first if project is repository-less

Closes #26687

See merge request !9009

Disable unused tags count cache for Projects, Builds and Runners

Closes #27989

See merge request !9467

Enable the RSpec/BeEql cop

See merge request !9476