fix: update timestamp retrieval to use asyncio event loop

Author: Ayaz-Microsoft

src/backend/v4/orchestration/orchestration_manager.py

@@ -587,7 +587,7 @@ async def run_orchestration(self, user_id: str, input_task, plan_id: Optional[st
                         "data": {
                             "content": user_error_message,
                             "status": "error",
-                            "timestamp": _time.time(),
+                            "timestamp": asyncio.get_event_loop().time(),
                         },
                     },
                     user_id,