Fix task leak on config entry unload/retry (#96981)

Since the task was added to self._tasks without a `task.add_done_callback(self._tasks.remove)`
each unload/retry would leak a new set of tasks

homeassistant/config_entries.py

@@ -687,7 +687,7 @@ async def _async_process_on_unload(self, hass: HomeAssistant) -> None:
         if self._on_unload is not None:
             while self._on_unload:
                 if job := self._on_unload.pop()():
-                    self._tasks.add(hass.async_create_task(job))
+                    self.async_create_task(hass, job)
 
         if not self._tasks and not self._background_tasks:
             return