Chore: complete to move to GitHub Actions #12625
What is the purpose of this pull request? (put an "X" next to item)
[X] Other, please explain: complete to move to GitHub Actions
What changes did you make? (Give an overview)
We have been running two CIs on GitHub Actions and Azure Pipelines in parallel because GitHub Actions had been beta. However, now GitHub Actions are stable. This PR completes switching to GitHub Actions.
Is there anything you'd like reviewers to focus on?
GitHub Actions doesn't have visualization features for code coverage. Is it acceptable?