Merge branch 'jp-db-validations-depth' into 'master'

Validate parent and child depth and cyclic references

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/105526



Merged-by: charlie ablett <cablett@gitlab.com>
Approved-by: Eugenia Grieff <egrieff@gitlab.com>
Approved-by: Steve Abrams <sabrams@gitlab.com>
Approved-by: charlie ablett <cablett@gitlab.com>
Co-authored-by: Jan Provaznik <jprovaznik@gitlab.com>