benchmark

4b4f5500 - Remove ONNX (#146325)

Remove ONNX (#146325) Summary: ONNX exporter experiments in benchmark is obsolete and unmaintained. This PR removes it to unblock https://github.com/pytorch/pytorch/pull/146003 X-link: https://github.com/pytorch/pytorch/pull/146325 Approved by: https://github.com/titaiwangms Reviewed By: ZainRizvi Differential Revision: D69115633 fbshipit-source-id: 20f264458f38d1dafde100970f07b6622e5b3d6e