Wait for registries to load at startup (#46265)

* Wait for registries to load at startup

* Don't decorate new functions with @bind_hass

* Fix typing errors in zwave_js

* Load registries in async_test_home_assistant

* Tweak

* Typo

* Tweak

* Explicitly silence mypy errors

* Fix tests

* Fix more tests

* Fix test

* Improve docstring

* Wait for registries to load

tests/components/template/test_sensor.py

@@ -3,6 +3,8 @@ from asyncio import Event
 from datetime import timedelta
 from unittest.mock import patch
 
+import pytest
+
 from homeassistant.bootstrap import async_from_config_dict
 from homeassistant.components import sensor
 from homeassistant.const import (
@@ -403,6 +405,7 @@ async def test_setup_valid_device_class(hass):
     assert "device_class" not in state.attributes
 
 
+@pytest.mark.parametrize("load_registries", [False])
 async def test_creating_sensor_loads_group(hass):
     """Test setting up template sensor loads group component first."""
     order = []