Adjust permitted params filtering on merge scheduling

Closes #46903

See merge request gitlab-org/gitlab-ce!19255

Resolve "Unable to start rails console if using master from gitlab-shell"

Closes #46991

See merge request gitlab-org/gitlab-ce!19251

Fix cattr_accessor definition

Closes #46282

See merge request gitlab-org/gitlab-ce!19192

Removal of API v3 from the codebase

Closes #36819

See merge request gitlab-org/gitlab-ce!18970

Resolve "Extra whitespace when hovering commit sha in MR widget"

Closes #46971

See merge request gitlab-org/gitlab-ce!19267

Fix various bugs related to relative_url_root in development

See merge request gitlab-org/gitlab-ce!19213

Improve structure of snippets documentation

See merge request gitlab-org/gitlab-ce!19234

Add Wiki and Snippets to project feature overview

See merge request gitlab-org/gitlab-ce!19235

* master: (32 commits)
  Update CHANGELOG.md for 10.8.3
  Update "col-xs" usage to bootstrap4
  Add missing usage_ping_enabled to API settings
  Make Repository#blob_data_at a public method
  Fix UI broken in line profiling modal due to Bootstrap 4
  Only preload member records for the relevant projects/groups/user in projects API
  Fix   after sign-in with Google button
  Fix a wrong link reference in docs
  Simplify spec: `2.times.each` -> `2.times`
  Replace grape-route-helpers with our own grape-path-helpers
  Add archived param to the json response
  Consider we might have prefix for stable branches
  Convert spec/javascripts/.eslintrc to yml format as well
  Remove version lock on awesome_print dependency
  Fix import project by url layout
  Fix missing timeout value in object storage pre-authorization call
  fix last lints
  disable no-multi-assign
  fix `spaced-comment`
  remove unused createComponentWithMixin from vue spec helpers
  ...

[ci skip]

Update "col-xs" usage to bootstrap4

Closes #47002

See merge request gitlab-org/gitlab-ce!19256

Make Repository#blob_data_at a public method

See merge request gitlab-org/gitlab-ce!19259