Dumps_v1: Use dataset-aware scheduling for the SQL/XML monitor DAG
We previously scheduled a run of the SQL/XML monitor DAG every 5 minutes, but this proved unreliable under load and unnecessary when there are no changes later in the month.
With this change, we use a named dataset representing the cephfs interim file system location. All of the SQL/XML sync tasks update this database, which in turn triggers a run of the SQL/XML monitor DAG.