Merge branch 'eread/document-new-documentation-metadata' into 'master'

Document new ignore_in_report documentation metadata

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/156464



Merged-by: Diana Logan <dlogan@gitlab.com>
Approved-by: Diana Logan <dlogan@gitlab.com>
Co-authored-by: Evan Read <eread@gitlab.com>