Store coverage files as artifacts for better debugging (#53126)
Summary:
Helps with https://github.com/pytorch/pytorch/issues/44120 by storing coverage as artifacts to be investigated
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53126
Reviewed By: walterddr
Differential Revision: D26757702
Pulled By: janeyx99
fbshipit-source-id: f7db2b3f51b9ee1a95178bdbd4b1c453078d2ba7
