DeleteMergedBranchesService should not delete protected branches

Closes #34553

See merge request !12624

Optimize creation of commit API by using Repository#commit instead of Repository#commits

See merge request !12623

When deleting all the branches that are merged, the protected branches
should not be deleted.

Hide archived project labels from the group issue tracker

Closes #26389

See merge request !12547

Fixed the y_label not setting correctly for each graph on the monitoring dashboard

Closes #34599

See merge request !12613

Repository#commits is expensive because it has to use Rugged to walk the Git
tree as opposed to doing a direct ref lookup.

Improves performance in #34533

[ci skip]

Update GITLAB_SHELL_VERSION to 5.1.1

See merge request !12615

Make autosize fields more performant and remove broken autosize handle

See merge request !12532

Make Project#ensure_repository force create a repo

Closes gitlab-ee#2800

See merge request !12580

Add environment_scope column to ci_variables table

See merge request !12363

Set default for "Remove source branch" to false

Closes #32885

See merge request !12576

Speed up operations performed by gitlab-shell

See merge request !12597

Resolve "Shared runners admin buttons have odd spacing"

Closes #32048

See merge request !12535

Add overview and use-cases to Issue Boards doc

See merge request !12543

* upstream/master: (79 commits)
  Reset @full_path to nil when cache expires
  add margin between captcha and register button
  Eagerly create a milestone that is used in a feature spec
  Adjust readme repo width
  Resolve "Issue Board -> "Remove from board" button when viewing an issue gives js error and fails"
  Fix rubocop offenses
  Make entrypoint and command keys to be array of strings
  Add issuable-list class to shared mr/issue lists to fix new responsive layout
  New navigation breadcrumbs
  Restore timeago translations in renderTimeago.
  Fix curl example paths (missing the 'files' segment)
  Automatically hide sidebar on smaller screens
  Fix typo in IssuesFinder comment
  Remove placeholder note when award emoji slash command is applied
  Make setSidebarHeight more efficient with SidebarHeightManager.
  Update CHANGELOG.md for 9.3.3
  Resolve "More actions dropdown hidden by end of diff"
  Use Gitaly 0.14.0
  Improve support for external issue references
  Make issuables_count_for_state public
  ...

Expires full_path cache after a repository is renamed/transferred

Closes gitlab-ee#2801

See merge request !12575

Update to >= 5.1.0 needed for https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2240 on EE.
Updated here to keep CE and EE on the same version.
5.1.1 includes https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/142 to revert changes which were causing problems with Post Receive hooks.

add margin between captcha and register button

Closes #29000

See merge request !12607

Fixed typo in gitlab_flow.md

See merge request !12561

Replaces 'dashboard/new-project.feature' spinach with rspec

See merge request !12550

Eagerly create a milestone that is used in a feature spec

Closes #34609

See merge request !12604

Fix curl example paths (missing the 'files' segment)

See merge request !12588

Use correct milestones for filtering on Group Issues

Closes #34116

See merge request !12374

Signed-off-by: Rémy Coutable <remy@rymai.me>

Remove unnecessary pull command from codeclimate job

See merge request !12583

Adjust readme repo width

See merge request !12585

Make clear that Go 1.8 is required since GitLab 9.2

Closes #34525

See merge request !12564

Fix performance bar specs

See merge request !12225