[Data] Remove shutdown logging from StreamingExecutor (ray-project#36408

)

Remove extra print while going through https://github.com/anyscale/Made-With-ML

<img width="1438" alt="Screen Shot 2023-06-13 at 8 38 36 PM" src="https://github.com/ray-project/ray/assets/113316/319f53ed-d143-470b-beb3-7f17d1faa14e">

python/ray/data/_internal/execution/streaming_executor.py

@@ -146,7 +146,7 @@ def shutdown(self):
  with self._shutdown_lock:
  if self._shutdown:
  return
- logger.get_logger().info(f"Shutting down {self}.")
+ logger.get_logger().debug(f"Shutting down {self}.")
  _num_shutdown += 1
  self._shutdown = True
  # Give the scheduling loop some time to finish processing.