Merge branch 'g385353-dequarantine-github-mirror-spec' into 'master'

Dequarantines `pipeline_for_project_mirror_github_spec`

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/115747



Merged-by: Tiffany Rea <trea@gitlab.com>
Approved-by: Tiffany Rea <trea@gitlab.com>
Approved-by: John McDonnell <jmcdonnell@gitlab.com>
Reviewed-by: Andrejs Cunskis <acunskis@gitlab.com>
Reviewed-by: Richard Chong <rchong@gitlab.com>
Co-authored-by: Richard Chong <rchong@gitlab.com>