[ci] Combine Runtime workflows

Merges most workflows into a single workflow, which should make the
"Checks" tab easier to visualize sincee it will all be graphed in a
single interface. There should be no change in behavior, this is a
mechanical change.

ghstack-source-id: a5241a24205a375555fd7f7d26339fb887070242
Pull Request resolved: https://github.com/facebook/react/pull/30324