Move StrEnum to homeassistant.backports and move Platform to homeassistant.const (#60880)

Co-authored-by: Franck Nijhof <frenck@frenck.nl>
Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>

homeassistant/helpers/entity_platform.py

@@ -34,7 +34,6 @@ from homeassistant.exceptions import (
 )
 from homeassistant.setup import async_start_setup
 from homeassistant.util.async_ import run_callback_threadsafe
-from homeassistant.util.enum import StrEnum
 
 from . import (
     config_validation as cv,
@@ -63,41 +62,6 @@ PLATFORM_NOT_READY_BASE_WAIT_TIME = 30  # seconds
 _LOGGER = getLogger(__name__)
 
 
-class Platform(StrEnum):
-    """Available platforms."""
-
-    AIR_QUALITY = "air_quality"
-    ALARM_CONTROL_PANEL = "alarm_control_panel"
-    BINARY_SENSOR = "binary_sensor"
-    BUTTON = "button"
-    CALENDAR = "calendar"
-    CAMERA = "camera"
-    CLIMATE = "climate"
-    COVER = "cover"
-    DEVICE_TRACKER = "device_tracker"
-    FAN = "fan"
-    GEO_LOCATION = "geo_location"
-    HUMIDIFIER = "humidifier"
-    IMAGE_PROCESSING = "image_processing"
-    LIGHT = "light"
-    LOCK = "lock"
-    MAILBOX = "mailbox"
-    MEDIA_PLAYER = "media_player"
-    NOTIFY = "notify"
-    NUMBER = "number"
-    REMOTE = "remote"
-    SCENE = "scene"
-    SELECT = "select"
-    SENSOR = "sensor"
-    SIREN = "siren"
-    SST = "sst"
-    SWITCH = "switch"
-    TTS = "tts"
-    VACUUM = "vacuum"
-    WATER_HEATER = "water_heater"
-    WEATHER = "weather"
-
-
 class AddEntitiesCallback(Protocol):
     """Protocol type for EntityPlatform.add_entities callback."""