Refactor Unary Ops tests (#49712)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/49712
Test Plan: Imported from OSS
Reviewed By: zou3519
Differential Revision: D25673712
Pulled By: izdeby
fbshipit-source-id: 4420d5d129026195097d914e410b75b144bea795
