Merge branch '385043-implement-model-registry-api-endpoints-and-services-0' into 'master'

Adds new services to handle MlModel packages

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/121247



Merged-by: Drew Blessing <drew@gitlab.com>
Approved-by: Madelein van Niekerk <mvanniekerk@gitlab.com>
Approved-by: Drew Blessing <drew@gitlab.com>
Reviewed-by: Drew Blessing <drew@gitlab.com>
Reviewed-by: Eduardo Bonet <ebonet@gitlab.com>
Reviewed-by: Madelein van Niekerk <mvanniekerk@gitlab.com>
Co-authored-by: Eduardo Bonet <ebonet@gitlab.com>