[ONNX] Remove duplicated test run (#81146)
Looks like caused by incorrect (auto) merge conflict resolution. `test_models_onnxruntime.py` script is run twice.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/81146
Approved by: https://github.com/justinchuby, https://github.com/AllenTiTaiWang, https://github.com/garymm
