Add step to report code coverage from GHA (#63373)
Summary:
Similar to the logic provided in https://github.com/pytorch/pytorch/blob/b2069e7d01814d776c417042e28133c6b0e5082f/.circleci/verbatim-sources/job-specs/pytorch-job-specs.yml#L197-L201
Fixes https://github.com/pytorch/pytorch/issues/63366
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63373
Reviewed By: walterddr
Differential Revision: D30357737
Pulled By: malfet
fbshipit-source-id: 20b115eb4d6412bd9895680308a9097742d2ae7b
