Fix rollback for an EE migration
Move the index removal to be before the column removal
Found this while trying to rollback 9-0-stable to 8.17.3
Related to the RC1 release testing in: https://gitlab.com/gitlab-org/gitlab-ce/issues/29170
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Move the index removal to be before the column removal
Found this while trying to rollback 9-0-stable to 8.17.3
Related to the RC1 release testing in: https://gitlab.com/gitlab-org/gitlab-ce/issues/29170