Move temperature conversions to sensor base class (8/8) (#54483)

* Move temperature conversions to entity base class (8/8)

* Fix wallbox sensor

* Fix tests

homeassistant/components/volvooncall/sensor.py

@@ -15,11 +15,11 @@ class VolvoSensor(VolvoEntity, SensorEntity):
     """Representation of a Volvo sensor."""
 
     @property
-    def state(self):
+    def native_value(self):
         """Return the state."""
         return self.instrument.state
 
     @property
-    def unit_of_measurement(self):
+    def native_unit_of_measurement(self):
         """Return the unit of measurement."""
         return self.instrument.unit