Add code coverage job to CI pipeline

[TaekyungHeo]

Summary

Add code coverage job to CI pipeline as suggested by @artemry-nv (link).

Test Plan

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[TaekyungHeo]

I got the following error.

orgoro/coverage@v3.1 is not allowed to be used in NVIDIA/cloudai. Actions in this workflow must be: within a repository that belongs to your Enterprise account, created by GitHub, verified in the GitHub Marketplace, or matching the following: NVIDIA/gitlab-answer-app/, aws-actions/configure-aws-credentials@, cinotify/github-action@, codecov/codecov-action@, conda-forge/automerge-action@, conda-incubator/setup-miniconda@, convictional/trigger-workflow-and-wait@, crazy-max/ghaction-docker-meta@, dangoslen/changelog-enforcer@, EndBug/add-and-commit@, jacobtomlinson/gha-anaconda-package-version@, jacobtomlinson/gha-find-replace@, peter-evans/create-pull-request@, peter-evans/dockerhub-description@, pre-commit/action@, pypa/gh-action-pypi-publish@, release-drafter/release-drafter@, ruby/setup-ruby@, softprops/action-gh-release@*, test-summary/action@

[artemry-nv]

The action should be enabled by NVIDIA GH support - @amaslenn can you please take a look?