Merge branch 'workspace-git-reference' into 'master'

Automatically select correct git reference based on referrer route

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/177680



Merged-by: Enrique Alcántara <ealcantara@gitlab.com>
Approved-by: Enrique Alcántara <ealcantara@gitlab.com>
Reviewed-by: Enrique Alcántara <ealcantara@gitlab.com>
Reviewed-by: GitLab Duo <gitlab-duo@gitlab.com>
Co-authored-by: Marcel van Remmerden <mvanremmerden@gitlab.com>