[ci] Unfork runtime_commit_artifacts

Promotes v2 to the primary workflow file so that we don't double write
to the protected branches.

Note: this may break DiffTrain temporarily, I will fix forward if so

ghstack-source-id: f6505a72f2edcf73aadf827d3a41e34d2a3227ba
Pull Request resolved: https://github.com/facebook/react/pull/30477