[rcr] Relax react peer dep requirement (#31915)

There's no real reason to restrict the React peer dep to
non-experimental, so relax it.

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Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/facebook/react/pull/31915).
* #31919
* #31918
* #31917
* #31916
* __->__ #31915
* #31920