Ensure all project factories use `:repository` trait or `:empty_project`
Home stretch of https://gitlab.com/gitlab-org/gitlab-ce/issues/24899#note_19284116!
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Home stretch of https://gitlab.com/gitlab-org/gitlab-ce/issues/24899#note_19284116!