* master: (78 commits)
  Use --left-right and --max-count for counting diverging commits
  API: get participants from merge_requests & issues
  Copy Mermaid graphs as GFM
  Rephrase paragraph about e2e tests in merge requests in docs
  Remove EE only sections from docs
  Update redis-rack to 2.0.4
  Refactor matchers for background migrations
  Add id to modal.vue to support data-toggle="modal"
  Allow local tests to use a modified Gitaly
  Fix specs
  Use computed prop in expand button
  Update check.md
  add deprecation and removal issue to docs
  Add status attribute to runner api entity
  Fix typos in a code comment
  Refactor RelativePositioning so that it can be used by other classes
  Backport 'Rebase' feature from EE to CE
  Just try to detect and assign once
  Fix custom name in branch creation for issue in Firefox
  Modify `LDAP::Person` to return username value based on attributes
  ...

Copy Mermaid graphs as GFM

Closes #41211

See merge request gitlab-org/gitlab-ce!16046

Use --left-right and --max-count for counting diverging commits

Closes #40622 et #37843

See merge request gitlab-org/gitlab-ce!15963

CE Backport of reordering issues in epics

See merge request gitlab-org/gitlab-ce!16247

Fix custom name in branch creation for issue in Firefox

Closes #41563

See merge request gitlab-org/gitlab-ce!16244

API: get participants from merge_requests & issues

Closes #40986

See merge request gitlab-org/gitlab-ce!16187

Resolve "Create secrets failed for Auto DevOps with latest stable of kubectl"

Closes #41376

See merge request gitlab-org/gitlab-ce!16218

Backport 'Rebase' feature from EE to CE

Closes #40301

See merge request gitlab-org/gitlab-ce!16071

Remove the Project#repo method

See merge request gitlab-org/gitlab-ce!16238

Add docs about end-to-end testing / GitLab QA tests

Closes #39637

See merge request gitlab-org/gitlab-ce!16043

Expose project_id on /api/v4/pages/domains

See merge request gitlab-org/gitlab-ce!16200

Don't use Gitlab::Shell#import_repository on local paths

See merge request gitlab-org/gitlab-ce!16228

[EE-backport] Add group boards API endpoint

See merge request gitlab-org/gitlab-ce!16194

Backport of methods and components added in EE

See merge request gitlab-org/gitlab-ce!16208

Update redis-rack to 2.0.4

See merge request gitlab-org/gitlab-ce!16251

Update settings.md

See merge request gitlab-org/gitlab-ce!16233

Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ce into 41563-fix-branch-creation-from-issue-in-firefox

Fix import project url not updating project name

Closes #40607

See merge request gitlab-org/gitlab-ce!16120

Add id to modal.vue to support data-toggle="modal"

Closes #41584

See merge request gitlab-org/gitlab-ce!16189

Up until version 2.0.3 redis-rack included a "rake" binary that would
overwrite/hijack the one provided by Rake itself. Unfortunately the
binary provided by redis-rack would produce errors in many cases. See
https://github.com/redis-store/redis-rack/pull/34 for more info.

Refactor cluster show page

Closes #41335

See merge request gitlab-org/gitlab-ce!16089

Allow local tests to use a modified Gitaly

Closes gitaly#833

See merge request gitlab-org/gitlab-ce!16220

Resolve "Verify integrity of repositories"

Closes #40228

See merge request gitlab-org/gitlab-ce!15931

Add online attribute to runner api entity

Closes #25774

See merge request gitlab-org/gitlab-ce!11750

Reroute batch blobs to single blob RPC

See merge request gitlab-org/gitlab-ce!16082

Prepare Gitlab::Git::Repository#rebase for Gitaly migration

See merge request gitlab-org/gitlab-ce!16192