Remove the ability to defer websocket message construction (#96734)

This was added in #71364 but all use cases of it were refactored
away so it can now be removed

homeassistant/components/websocket_api/auth.py

@@ -57,7 +57,7 @@ class AuthPhase:
         self,
         logger: WebSocketAdapter,
         hass: HomeAssistant,
-        send_message: Callable[[str | dict[str, Any] | Callable[[], str]], None],
+        send_message: Callable[[str | dict[str, Any]], None],
         cancel_ws: CALLBACK_TYPE,
         request: Request,
     ) -> None: