Allow exposing entities not in the entity registry to assistants (#92363)

tests/components/homekit/test_diagnostics.py

@@ -319,6 +319,7 @@ async def test_config_entry_with_trigger_accessory(
     entity_registry: er.EntityRegistry,
 ) -> None:
     """Test generating diagnostics for a bridge config entry with a trigger accessory."""
+    assert await async_setup_component(hass, "homeassistant", {})
     assert await async_setup_component(hass, "demo", {"demo": {}})
     hk_driver.publish = MagicMock()