When the GitHub importer creates a merge request, it retrieves the SHA
but does not actually create the source branch. This makes it impossible
to merge an open merge request, particularly if the source branch were
from a forked project. In that case, the branch will never exist because
the original `project-name:source-branch` name is never created, nor
is it a valid branch name.

To prevent possible branch name conflicts, forked source branches
are now renamed `github/fork/project-name/source-branch` and created
when necessary.

Note that we only create the source branch if the merge request
is open. For projects that have many merge requests, the project
would end up with a lot of possibly dead branches.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/57370

Docs: correct word

See merge request gitlab-org/gitlab-ce!25065

Fix create_project_spec

Closes gitlab-org/quality/staging#32

See merge request gitlab-org/gitlab-ce!25029

Removes milestone from cluster base domain documentation

See merge request gitlab-org/gitlab-ce!25045

Fix error when reloading code in Sidekiq

Closes #54320

See merge request gitlab-org/gitlab-ce!25069

This commit fixes the following error in development:

    ArgumentError: A copy of Gitlab::Metrics::Transaction has been
    removed from the module tree but is still active!

Resolve "ActionView::Template::Error: undefined method `>' for nil:NilClass"

Closes #57428

See merge request gitlab-org/gitlab-ce!25028

Adds a feature flag to the diff fuzzy file finder

Closes #57403

See merge request gitlab-org/gitlab-ce!25006

12.0 milestone was removed from cluster base domain on AutoDevOps
documentation to avoid making fake promises.

Update `chart.js` to 2.7.2

See merge request gitlab-org/gitlab-ce!24771

Fix push_http_private_token_spec by waiting for viewers to load

Closes gitlab-org/quality/staging#33

See merge request gitlab-org/gitlab-ce!25030

Mention when the Registry API was introduced

See merge request gitlab-org/gitlab-ce!24596

Fixes diff web worker not loading in staging

See merge request gitlab-org/gitlab-ce!25039

Clarify search parameter in the branches API docs

See merge request gitlab-org/gitlab-ce!24703

Update group permission docs

See merge request gitlab-org/gitlab-ce!24768

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/57403

Docs: Add link to API for GitHub imports

See merge request gitlab-org/gitlab-ce!24808

Refactor draft_note_spec.js to Vue test utils (CE backport)

See merge request gitlab-org/gitlab-ce!25016

https://gitlab.com/gitlab-org/quality/staging/issues/34

Fixes link to wrong section

See merge request gitlab-org/gitlab-ce!24811

Refactor broadcast message API page

See merge request gitlab-org/gitlab-ce!24920

Refactor snippets API documentation page

See merge request gitlab-org/gitlab-ce!24921

Fix many 'when manual' anchors

See merge request gitlab-org/gitlab-ce!24947

Remove #make_updated! as have #make_installed! now

Closes #57374

See merge request gitlab-org/gitlab-ce!24988

docs: trivial: remove stray extra "to"

See merge request gitlab-org/gitlab-ce!25024

Move permission check of manual actions of deployments

Closes #52412

See merge request gitlab-org/gitlab-ce!24660

Fix spelling and other minor improvements

See merge request gitlab-org/gitlab-ce!24813

Adds qa-spinner class and wait for it to go away
before making assertions.

Update index.md

See merge request gitlab-org/gitlab-ce!24698

Anchor link was incorrect

See merge request gitlab-org/gitlab-ce!24922

docs: capitalization fixes in Gitaly docs

See merge request gitlab-org/gitlab-ce!24994