Revert "[AIRFLOW-5608] Gracefully stop executor when SIGTERM is received by SchedulerJob (#6274)"
Revert "[AIRFLOW-5608] Gracefully stop executor when SIGTERM is received by SchedulerJob (#6274)"

This reverts commit d0cf27c240cd8b453f4f1bd53618f358aef1c51a.

owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow