Only check new migrations in 'rake downtime_check'
If this fix works, this MR will NOT have a failing rake downtime_check
build. If it doesn't, it will.
So if the build goes green, it works!
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
If this fix works, this MR will NOT have a failing rake downtime_check
build. If it doesn't, it will.
So if the build goes green, it works!