Attach template triggers at start eagerly (#113120)

This method calls async_initialize_triggers which is likely to never
suspend and the attach can avoid being scheduled on the event loop

homeassistant/components/template/coordinator.py

@@ -47,7 +47,7 @@ class TriggerUpdateCoordinator(DataUpdateCoordinator):
             await self._attach_triggers()
         else:
             self._unsub_start = self.hass.bus.async_listen_once(
-                EVENT_HOMEASSISTANT_START, self._attach_triggers
+                EVENT_HOMEASSISTANT_START, self._attach_triggers, run_immediately=True
             )
 
         for platform_domain in PLATFORMS: