Remove deleted milestones from merge requests
This is related to !1348 (merged) but thought it would be useful as a separate MR. This MR removes deleted milestone IDs from any merge request.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This is related to !1348 (merged) but thought it would be useful as a separate MR. This MR removes deleted milestone IDs from any merge request.