Improve validation of device trigger config (#26910)

* Improve validation of device trigger config

* Remove action and condition checks

* Move config validation to own file

* Fix tests

* Fixes

* Fixes

* Small tweak

homeassistant/components/config/automation.py

@@ -3,6 +3,7 @@ from collections import OrderedDict
 import uuid
 
 from homeassistant.components.automation import DOMAIN, PLATFORM_SCHEMA
+from homeassistant.components.automation.config import async_validate_config_item
 from homeassistant.const import CONF_ID, SERVICE_RELOAD
 import homeassistant.helpers.config_validation as cv
 
@@ -26,6 +27,7 @@ async def async_setup(hass):
             cv.string,
             PLATFORM_SCHEMA,
             post_write_hook=hook,
+            data_validator=async_validate_config_item,
         )
     )
     return True