Remove unnecessary eager load of project in milestone index
Found by Bullet in !10263 (merged) as seen in https://gitlab.com/gitlab-org/gitlab-ce/builds/13490762
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Found by Bullet in !10263 (merged) as seen in https://gitlab.com/gitlab-org/gitlab-ce/builds/13490762