Merge branch 'led/update-members-api-and-docs-queued' into 'master'

Update API and docs to account for non-billable promotions

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167020



Merged-by: Abdul Wadood <awadood@gitlab.com>
Approved-by: Abdul Wadood <awadood@gitlab.com>
Reviewed-by: Abdul Wadood <awadood@gitlab.com>
Reviewed-by: Bishwa Hang Rai <bhrai@gitlab.com>
Co-authored-by: Suraj Tripathi <stripathi@gitlab.com>
Co-authored-by: Sheldon Led <sheldonled@gitlab.com>