Replace stubbed data in merge request entity with real one
MR into intermediate branch. Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/25424
cc @fatihacet
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
MR into intermediate branch. Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/25424
cc @fatihacet