Prepare 10.4 RC2 release

See merge request gitlab-org/gitlab-ce!16295

Remove unnecessary queries on Merge Request Metrics population scheduler

Closes gitlab-org/release/tasks#13

See merge request gitlab-org/gitlab-ce!16292

Fix error 500 when viewing commit and merge request diffs

Closes #41735

See merge request gitlab-org/gitlab-ce!16272

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

Enclose props in double quotes for Item Stats in Groups tree app

See merge request gitlab-org/gitlab-ce!16231

Update some Gitaly annotations in Gitlab::Shell

See merge request gitlab-org/gitlab-ce!16226