Merge branch 'bwill/only-ingest-sbom-reports-on-default-branch' into 'master'

Only enqueue Sbom::IngestReportsWorker on default branches

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/116971



Merged-by: Allison Browne <abrowne@gitlab.com>
Approved-by: Zamir Martins <zfilho@gitlab.com>
Approved-by: Allison Browne <abrowne@gitlab.com>
Co-authored-by: Brian Williams <bwilliams@gitlab.com>