Add missing policy specs for `internal` users

The following discussion from !28071 (merged) should be addressed:

• @splattael started a discussion:

  As @engwan mentioned in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/12127#note_166674829

  I think no specs failed when we commented this line previously right?

  If so, I think we should create an issue for missing test coverage related to support bot and quick actions.