Merge branch 'jh/update-self-hosted-models-admin-menu-item-permissions' into 'master'

Use :manage_self_hosted_models_settings policy to manage visibility of Self-hosted models pages in admin dashboard

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/176070



Merged-by: Igor Drozdov <idrozdov@gitlab.com>
Approved-by: Igor Drozdov <idrozdov@gitlab.com>
Co-authored-by: Julie Huang <julhuang@gitlab.com>