[ONNX] Suppress ort warnings in onnx related test (#67054) (#67804)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/67804
Improve readability of test logs by suppressing ort warnings logging for onnx related test.
Reducing ONNX CI test log binary size:
linux-xenial-py3.6-clang7-onnx-test1: 12443 KB -> 6958 KB
linux-xenial-py3.6-clang7-onnx-test2: 16884 KB -> 5778 KB
Test Plan: Imported from OSS
Reviewed By: msaroufim
Differential Revision: D32181308
Pulled By: malfet
fbshipit-source-id: 11cf165dc212d061606590e96c08c6e021135f74
Co-authored-by: BowenBao<bowbao@microsoft.com>
