onnx/test.sh: Run test/onnx in only shard 1 (#65722)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/65458
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65722
Reviewed By: albanD
Differential Revision: D31223236
Pulled By: janeyx99
fbshipit-source-id: 3b648cb940a95866f465b27b8bdc74b06d258140
