Ensure all refs are restored on a backup/restore

Closes #38352

See merge request gitlab-org/gitlab-ce!14595

Update CONTRIBUTING.md

See merge request gitlab-org/gitlab-ce!14591

Add changelog lint script to docs lint CI job

See merge request gitlab-org/gitlab-ce!14618

Implement OperationService.UserAddBranch Gitaly RPC

Closes gitaly#544

See merge request gitlab-org/gitlab-ce!14522

Remove global components

See merge request gitlab-org/gitlab-ce!14579

Ensure no exception is raised when Raven tries to get the current user in API context

Closes #38571

See merge request gitlab-org/gitlab-ce!14580

Resolve "Issue Sidebar : Don't render participants in collapsed state"

Closes #34366

See merge request gitlab-org/gitlab-ce!14270

Use `simple=true` for projects API in Projects dropdown for better search performance

Closes #38052

See merge request gitlab-org/gitlab-ce!14585

Merge branch 'master-i18n' into 'master'

See merge request gitlab-org/gitlab-ce!14608

Add GL_USERNAME environment variable for hooks

See merge request gitlab-org/gitlab-ce!13264

Fix pushes to an empty repository not invalidating has_visible_content? cache

Closes #38646

See merge request gitlab-org/gitlab-ce!14613

Updates to Helm chart docs

Closes #38616

See merge request gitlab-org/gitlab-ce!14589

`Repository#has_visible_content?` used to rely on the cached count of local branches, but
since it is now an independently cached value it needs to be invalidated on its own.

Closes #38646

New Crowdin translations

See merge request gitlab-org/gitlab-ee!2947

Add environment variable to bypass n+1

See merge request gitlab-org/gitlab-ce!14451

Fix Admin -> License selector for GitLab QA specs

Closes gitlab-qa#68

See merge request gitlab-org/gitlab-ce!14599

Add GitLab QA documentation

See merge request gitlab-org/gitlab-ce!14600

[ci skip]

remove period

See merge request gitlab-org/gitlab-ce!14598

Closes gitlab-qa#68

[skip ci]

To restore all refs from a bundle, we need to use the --mirror option to
ensure that all refs are properly restored. Without this, refs such as
`refs/merge-requests/X` and `refs/keep-around/Y` would be omitted, which
exposed a bug as described in https://gitlab.com/gitlab-org/gitlab-ce/issues/38319#note_41648608.

Closes #38352

When calling pre-receive, post-receive, and update hooks, add the GitLab
username as the GL_USERNAME environment variable.

This patch only handles cases where pushes are over http, or via
the web interface.  Later, we will address the ssh case.

Fix incorrectly aligned last updated time

Closes #38624

See merge request gitlab-org/gitlab-ce!14592