Set TORCH_CPP_LOG_LEVEL=ERROR for reduced verbosity (#12989)

* modify torch cpp log level to Error to avoid annoying print

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export.py

@@ -48,6 +48,8 @@ import argparse
 import contextlib
 import json
 import os
+
+os.environ["TORCH_CPP_LOG_LEVEL"] = "ERROR"
 import platform
 import re
 import subprocess