Add Runner registration/deletion API

See merge request !9246

* 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
  ...

* upstream/master: (234 commits)
  Improve performance of User Agent Detail
  Fix some grammar in the API docs
  Remove shared example for pagination
  API: Use POST to (un)block a user
  API: Moved `DELETE /projects/:id/star` to `POST /projects/:id/unstar`
  Use grape validation for dates
  Change wording for LDAP doc that was moved to a new location
  API: Remove `DELETE projects/:id/deploy_keys/:key_id/disable`
  Download snippets with LF line-endings by default
  utilize pre-minified Vue in production since no CJS distribution is available
  Prevent project team from being truncated too early during project destruction
  loading icon sometimes toggled alongside MR pipeline contents
  fix failed spec because haml_lint
  fix incorrect sidekiq concurrency count in admin background page
  exclude rpc_pipefs from system disc info
  Fix wrong line ending [ci-skip]
  fix overlooked window binding in spec files
  remove imports loader
  replace implicit this == window with explicit binding
  Todo done clicking is kind of unusable.
  ...

* upstream/master: (37 commits)
  Show merge errors in merge request widget
  Clarify that stage is needed to stop environments
  Fix broken link in university docs
  allow clicking on text or icon to trigger expand
  style links on system notes to look clickable
  Clean up terms used for issues. Use New instead of Add.
  Fix most of broken docs links
  Set `Auto-Submitted: auto-generated` header to emails
  Fix Rubocop offense
  Fix regression where cmd-click stopped working for todos and merge request tabs
  Remove changelog entries for 8.16.5 release
  Merge branch 'fix-github-import-MR-wrong-project' into 'security'
  Merge branch 'svg-xss-fix' into 'security'
  Merge branch 'fix-rdoc-xss' into 'security'
  Merge branch 'asciidoctor-xss-patch' into 'security'
  Specify that only project owners can transfer a project
  only load istanbul plugin in development mode
  Make Karma output look nicer for CI (!9165)
  Centers loading icon vertically and horizontally in pipelines table in commit view
  Rename builds to jobs in docs
  ...

Add missing api entities

Closes #23895

See merge request !7138

Nested groups improvements pt 3

See merge request !9227