feat: compatibility with React 19 types

[aymeric-giraudet]

Summary

See #1297

We were relying on the ambient module from @types/react which is a devDependency of the monorepo itself, but since React 19 JSX is no longer global and that made certain files in autocomplete-shared and autocomplete-js fail type check.

Result

Changed JSX.Element to VNode<any> in the code as it's equivalent :
https://github.com/preactjs/preact/blob/4b7e23194bf61ab3764b9d86adb22a4aeafd67ec/src/jsx.d.ts#L63

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[Haroenv]

change in types lgtm, just want to change the name of the react-17 folder or maybe delete it if it's superfluous with the regular react example