Update react-native/react-dom build directory (#31006)

Commit artifact actions are breaking after
https://github.com/facebook/react/pull/30711

See:
https://github.com/facebook/react/actions/runs/10930658977/job/30344033974

> mv: cannot stat 'build/facebook-react-native/react/dom/': No such file
or directory

After build, the new artifacts are in `/react-dom/cjs`, not
`/react/dom/`
```
$> yarn build
$> ls build/facebook-react-native/react/
# ... no dom
$> ls build/facebook-react-native/react-dom/cjs
```