Always setup demo platforms with device support from config entry (#94586)

* Always setup demo platforms with device support from config entry

* Adjust test fixutres

* Update tests depending on the demo integration

tests/components/light/test_recorder.py

@@ -2,6 +2,9 @@
 from __future__ import annotations
 
 from datetime import timedelta
+from unittest.mock import patch
+
+import pytest
 
 from homeassistant.components import light
 from homeassistant.components.light import (
@@ -14,7 +17,7 @@ from homeassistant.components.light import (
 )
 from homeassistant.components.recorder import Recorder
 from homeassistant.components.recorder.history import get_significant_states
-from homeassistant.const import ATTR_FRIENDLY_NAME
+from homeassistant.const import ATTR_FRIENDLY_NAME, Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.setup import async_setup_component
 from homeassistant.util import dt as dt_util
@@ -23,6 +26,16 @@ from tests.common import async_fire_time_changed
 from tests.components.recorder.common import async_wait_recording_done
 
 
+@pytest.fixture(autouse=True)
+async def light_only() -> None:
+    """Enable only the light platform."""
+    with patch(
+        "homeassistant.components.demo.COMPONENTS_WITH_CONFIG_ENTRY_DEMO_PLATFORM",
+        [Platform.LIGHT],
+    ):
+        yield
+
+
 async def test_exclude_attributes(recorder_mock: Recorder, hass: HomeAssistant) -> None:
     """Test light registered attributes to be excluded."""
     now = dt_util.utcnow()