Migrate Speedtest.net to new entity naming style (#75004)

homeassistant/components/speedtestdotnet/sensor.py

@@ -49,6 +49,7 @@ class SpeedtestSensor(
     """Implementation of a speedtest.net sensor."""
 
     entity_description: SpeedtestSensorEntityDescription
+    _attr_has_entity_name = True
     _attr_icon = ICON
 
     def __init__(
@@ -59,7 +60,6 @@ class SpeedtestSensor(
         """Initialize the sensor."""
         super().__init__(coordinator)
         self.entity_description = description
-        self._attr_name = f"{DEFAULT_NAME} {description.name}"
         self._attr_unique_id = description.key
         self._state: StateType = None
         self._attrs = {ATTR_ATTRIBUTION: ATTRIBUTION}