Merge branch '412384-disabling-model-experiments-in-packages-and-registries-1' into 'master'

Adds model for model_experiments_access_level

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/121650



Merged-by: Kassio Borges <kborges@gitlab.com>
Approved-by: Harsimar Sandhu <hsandhu@gitlab.com>
Approved-by: Ian Baum <ibaum@gitlab.com>
Approved-by: Kassio Borges <kborges@gitlab.com>
Reviewed-by: Eduardo Bonet <ebonet@gitlab.com>
Co-authored-by: Eduardo Bonet <ebonet@gitlab.com>