The existing flow-ci script makes some assumptions about running inside
of circleci for parallelization. This PR forks the script with very smal
ll tweaks to allow for a short name to be passed in as an argument.
These short names are discovered in a new GH job and then each one is
passed as an argument for parallelization
ghstack-source-id: dc85486388f74088c22b386b77b45996ef753f1a
Pull Request resolved: https://github.com/facebook/react/pull/30026
419ace93ec