Skip testing torch.float16 in test_isnan (#55906)
Summary:
See https://github.com/pytorch/pytorch/issues/55905
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55906
Reviewed By: walterddr
Differential Revision: D27737356
Pulled By: malfet
fbshipit-source-id: 39571cfe6f078af8bb7387ed459a5d0f2410bad1
