🐛 fix(chat.py): add exception logging to stream_build function to improve error handling

The `stream_build` function now logs the exception that occurred during the flow building process using the `logger.exception` method. This improves error handling and provides more detailed information about the error in the logs.

src/backend/langflow/api/v1/chat.py

@@ -139,6 +139,7 @@ async def stream_build(flow_id: str):
             # We need to reset the chat history
             chat_manager.chat_history.empty_history(flow_id)
         except Exception as exc:
+            logger.exception(exc)
             logger.error("Error while building the flow: %s", exc)
             yield str(StreamData(event="error", data={"error": str(exc)}))
         finally: