Add cancel messages to core task cancelation (#96972)

homeassistant/core.py

@@ -764,7 +764,7 @@ class HomeAssistant:
         for task in self._background_tasks:
             self._tasks.add(task)
             task.add_done_callback(self._tasks.remove)
-            task.cancel()
+            task.cancel("Home Assistant is stopping")
         self._cancel_cancellable_timers()
 
         self.exit_code = exit_code
@@ -814,7 +814,7 @@ class HomeAssistant:
                 "the stop event to prevent delaying shutdown",
                 task,
             )
-            task.cancel()
+            task.cancel("Home Assistant stage 2 shutdown")
             try:
                 async with async_timeout.timeout(0.1):
                     await task