[ONNX] Add flag to enable script tests (#32654)
Summary:
This will allow us to incrementally enable more tests for scripting as we put in fixes. houseroad spandantiwari
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32654
Reviewed By: hl475
Differential Revision: D19583401
Pulled By: houseroad
fbshipit-source-id: 8dc05e4784df819c939dffdf33b00cbb80bfa364
