Skip test_wrap_bad if run under pytest (#115070)
Summary:
Pytest replaces sys.stdout/stderr by `TextIOWrapper` instances which do not support `fileno()`
Hence skip that test in this case
Fixes #115069
X-link: https://github.com/pytorch/pytorch/pull/115070
Approved by: https://github.com/clee2000
Reviewed By: huydhn
Differential Revision: D53791553
fbshipit-source-id: 5554e27cbf71e6ad46331ea4884145eb50a17d9c
