Use entity class attributes for aftership (#52500)

* Use entity class attributes for aftership

* Tweaks

Co-authored-by: Franck Nijhof <git@frenck.dev>

homeassistant/components/aftership/sensor.py

@@ -109,38 +109,26 @@ async def async_setup_platform(
 class AfterShipSensor(SensorEntity):
     """Representation of a AfterShip sensor."""
 
+    _attr_unit_of_measurement: str = "packages"
+    _attr_icon: str = ICON
+
     def __init__(self, aftership: Tracking, name: str) -> None:
         """Initialize the sensor."""
         self._attributes: dict[str, Any] = {}
-        self._name: str = name
         self._state: int | None = None
         self.aftership = aftership
-
+        self._attr_name = name
-    @property
-    def name(self) -> str:
-        """Return the name of the sensor."""
-        return self._name
 
     @property
     def state(self) -> int | None:
         """Return the state of the sensor."""
         return self._state
 
-    @property
-    def unit_of_measurement(self) -> str:
-        """Return the unit of measurement of this entity, if any."""
-        return "packages"
-
     @property
     def extra_state_attributes(self) -> dict[str, str]:
         """Return attributes for the sensor."""
         return self._attributes
 
-    @property
-    def icon(self) -> str:
-        """Icon to use in the frontend."""
-        return ICON
-
     async def async_added_to_hass(self) -> None:
         """Register callbacks."""
         self.async_on_remove(