Fix callback and async (#31281)

* Fix callback and async

* Fix a return

* Fix test

* Fix mqtt tests

* Fix some more callbacks

homeassistant/components/automation/litejet.py

@@ -92,6 +92,7 @@ async def async_attach_trigger(hass, config, action, automation_info):
     hass.data["litejet_system"].on_switch_pressed(number, pressed)
     hass.data["litejet_system"].on_switch_released(number, released)
 
+    @callback
     def async_remove():
         """Remove all subscriptions used for this trigger."""
         return