Fix cloud webhook body (#20739)

* Bugfix cloud webhooks text response

* address comments

* Fix lint

homeassistant/components/cloud/utils.py

@@ -0,0 +1,13 @@
+"""Helper functions for cloud components."""
+from typing import Any, Dict
+
+from aiohttp import web
+
+
+def aiohttp_serialize_response(response: web.Response) -> Dict[str, Any]:
+    """Serialize an aiohttp response to a dictionary."""
+    return {
+        'status': response.status,
+        'body': response.text,
+        'headers': dict(response.headers),
+    }