Merge branch 'sc1-readonly-pipeline-multistore' into 'master'

Support readonly pipelines in MultiStore

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/123904



Merged-by: Bob Van Landuyt <bob@gitlab.com>
Approved-by: Bob Van Landuyt <bob@gitlab.com>
Approved-by: Gregorius Marco <gmarco@gitlab.com>
Reviewed-by: Bob Van Landuyt <bob@gitlab.com>
Co-authored-by: Sylvester Chin <schin@gitlab.com>