Merge branch 'michold-document-UsageDataNonSqlMetrics' into 'master'

Add UsageDataNonSqlMetrics OpenAPI documentation

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/104706



Merged-by: Tetiana Chupryna <tchupryna@gitlab.com>
Approved-by: Alina Mihaila <amihaila@gitlab.com>
Approved-by: Tetiana Chupryna <tchupryna@gitlab.com>
Co-authored-by: michold <mwielich@gitlab.com>