Detect lingering threads after tests (#37270)

* Detect lingering threads after tests

* Make sure cast is setup before checking state

* Make sure we ask executors of old hass to shutdown

We are not waiting here, just hoping for the best

* Make sure all instances of hass and executors is stopped.

Co-authored-by: Paulus Schoutsen <balloob@gmail.com>

* Also apply hass stopping to scripts

* Adjust to changes how we set up executor

* Add new CoreState.stopped

Co-authored-by: Paulus Schoutsen <balloob@gmail.com>

homeassistant/bootstrap.py

@@ -141,6 +141,7 @@ async def async_setup_hass(
 
         safe_mode = True
         old_config = hass.config
+
         hass = core.HomeAssistant()
         hass.config.skip_pip = old_config.skip_pip
         hass.config.internal_url = old_config.internal_url