[ONNX] Update the script for version updates (#83283)
This PR updates the `tools/onnx/update_default_opset_version.py` script to ensure files are edited correctly to prepare for the opset 17 support in torch.onnx.
- (clean up) Move script to `main()`
- Add an `--skip_build` option to avoid building pytorch if we want to rerun the process due to errors after compilation is done
- Update to edit the correct files now that the onnx files were refactored
Pull Request resolved: https://github.com/pytorch/pytorch/pull/83283
Approved by: https://github.com/thiagocrepaldi, https://github.com/AllenTiTaiWang, https://github.com/abock
