Merge branch '440141-reject-project-ci-jobs-on-reserved-policy-stages' into 'master'

Reject project CI jobs on reserved policy stages

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/146307



Merged-by: Grzegorz Bizon <grzegorz@gitlab.com>
Approved-by: Marcos Rocha <mrocha@gitlab.com>
Approved-by: Leaminn Ma <lma@gitlab.com>
Reviewed-by: Grzegorz Bizon <grzegorz@gitlab.com>
Co-authored-by: Andy Soiron <asoiron@gitlab.com>