Merge branch 'model_registry/shallow_mount' into 'master'

Update spec to use shallowMount

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/150366



Merged-by: Zack Cuddy <zcuddy@gitlab.com>
Approved-by: Zack Cuddy <zcuddy@gitlab.com>
Co-authored-by: Eduardo Bonet <ebonet@gitlab.com>