Add support for universal LLMContext to Google Vertex AI LLM service

src/pipecat/services/google/llm_vertex.py

@@ -139,12 +139,3 @@ class GoogleVertexLLMService(OpenAILLMService):
         creds.refresh(Request())  # Ensure token is up-to-date, lifetime is 1 hour.
 
         return creds.token
-
-    @property
-    def supports_universal_context(self) -> bool:
-        """Check if this service supports universal LLMContext.
-
-        Returns:
-            False, as GoogleVertexLLMService does not yet support universal LLMContext.
-        """
-        return False