JSX type extensions should use `scoped-jsx` under React.JSX.IntrinsicElements

[mattcosta7]

React 18 and 19 have migrated to a scoped jsx namespace that's scoped under React - so instead of a global JSX.IntrinsicElements it's React.JSX.IntrinsicElements.

This element should use the preferred scoping instead

https://react.dev/blog/2024/04/25/react-19-upgrade-guide#the-jsx-namespace-in-typescript

This is noted in the upgrade guide. React 18 types were upgraded to suppor this as well, so it should be backward compatible