[#280] Migrate test jobs except Firebase Lab testing to GitHub Actions #379
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Links #280
Moved some test jobs from CircleCI to GitHub Actions.
No tests may run on this PR because of the security reason; I'm not sure if workflow approvals work for forked PRs that introduce new workflow files. 🙇
If workflow approvals don't work, could you please pull this branch, push your repository and open a PR to check? See my PR (jmatsu#1) for a reference too.