Revert "Remove DatabaseMigrationStateSchedule (#1689)" (#1698)

This reverts commit 18d51738ce.

db/src/main/resources/sql/flyway/V119__drop_database_migration_schedule.sql

@@ -1,15 +0,0 @@
--- Copyright 2021 The Nomulus Authors. All Rights Reserved.
---
--- Licensed under the Apache License, Version 2.0 (the "License");
--- you may not use this file except in compliance with the License.
--- You may obtain a copy of the License at
---
---     http://www.apache.org/licenses/LICENSE-2.0
---
--- Unless required by applicable law or agreed to in writing, software
--- distributed under the License is distributed on an "AS IS" BASIS,
--- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
--- See the License for the specific language governing permissions and
--- limitations under the License.
-
-DROP TABLE IF EXISTS "DatabaseMigrationStateSchedule" CASCADE;