Shutdown hang (#11793)

* intentionally handle queues during shutdown and carefully manage shutdown order

* more carefully manage shutdown to avoid threadlocks

* use debug for signal logging

* ensure disabled cameras dont break shutdown

* typo

frigate/events/audio.py

@@ -83,6 +83,7 @@ def listen_to_audio(
         logger.info("Exiting audio detector...")
 
     def receiveSignal(signalNumber: int, frame: Optional[FrameType]) -> None:
+        logger.debug(f"Audio process received signal {signalNumber}")
         stop_event.set()
         exit_process()