Cleanup scheduler logs as part of the purge_old_logs_from_s3 DAG
Now that we're going to start migrating scheduler to Kubernetes, we need
the purge_old_logs_from_s3
DAG to cleanup scheduler logs as well, not
just DAG task logs.
Bug: T364389 Signed-off-by: Balthazar Rouberol brouberol@wikimedia.org