dillon1000/react

CI: try to make caching more reliable (#25259)

- `~/.yarn/cache` is now restored from an hierarchical cache key, if no precise match is found, we fallback to less precise ones. 
- The yarn install in `fixtures/dom` is also cached. Notably, is utilizes the cache from root, but stores into its more precise key.
- Steps running in root no longer have a `yarn install` and rely on the cache from the setup step.
- Retry `yarn install` once on failure.