Remove unused Grit configuration settings
This caused confusion with a customer issue in https://gitlab.com/gitlab-org/gitlab-ee/issues/3461 and continues on the work in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7308.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This caused confusion with a customer issue in https://gitlab.com/gitlab-org/gitlab-ee/issues/3461 and continues on the work in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7308.