Fix wrong error message expectation in API::Commits spec
See commit message or https://gitlab.com/gitlab-org/gitlab-ce/issues/25651#note_19996076 for the explanation.
Closes #25651 (closed)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
See commit message or https://gitlab.com/gitlab-org/gitlab-ce/issues/25651#note_19996076 for the explanation.
Closes #25651 (closed)