Fixes #21402: Prefetch device_type and manufacturer for brief mode API responses (#21616)

* Fixes #21402: Prefetch device_type and manufacturer for brief mode API responses

Add select_related for device_type__manufacturer on the DeviceViewSet
queryset to prevent N+1 queries when rendering unnamed devices in brief
mode.

* Use prefetch_related instead of select_related for device_type__manufacturer

netbox/dcim/api/views.py

@@ -405,6 +405,7 @@ class DeviceViewSet(
     NetBoxModelViewSet
 ):
     queryset = Device.objects.prefetch_related(
+        'device_type__manufacturer',  # Referenced by Device.__str__() for unnamed devices
         'parent_bay',  # Referenced by DeviceSerializer.get_parent_device()
     )
     filterset_class = filtersets.DeviceFilterSet