Move icon constants to entity attributes (#90518)

* Move icon constants to attribute

* Adjust test

tests/components/srp_energy/test_sensor.py

@@ -3,9 +3,7 @@ from unittest.mock import MagicMock
 
 from homeassistant.components.sensor import SensorDeviceClass, SensorStateClass
 from homeassistant.components.srp_energy.const import (
-    ATTRIBUTION,
     DEFAULT_NAME,
-    ICON,
     SENSOR_NAME,
     SENSOR_TYPE,
     SRP_ENERGY_DOMAIN,
@@ -91,10 +89,10 @@ async def test_srp_entity(hass: HomeAssistant) -> None:
     assert srp_entity.unique_id == SENSOR_TYPE
     assert srp_entity.state is None
     assert srp_entity.unit_of_measurement == UnitOfEnergy.KILO_WATT_HOUR
-    assert srp_entity.icon == ICON
+    assert srp_entity.icon == "mdi:flash"
     assert srp_entity.usage == "2.00"
     assert srp_entity.should_poll is False
-    assert srp_entity.attribution == ATTRIBUTION
+    assert srp_entity.attribution == "Powered by SRP Energy"
     assert srp_entity.available is not None
     assert srp_entity.device_class is SensorDeviceClass.ENERGY
     assert srp_entity.state_class is SensorStateClass.TOTAL_INCREASING