4dd9510a50 changed `React.ReactType` to look at entries in the `JSX.IntrinsicElements` map, which caused rendering `React.ReactType<any>` elements to fail. This commit fixes the RN type declarations by returning `any`. We don't care about the actual return type that much -- it's concretely a string but externally, as a user of react-native, you'd want to only use it as a JSX component type and not as a string.
And since it's a string that isn't registered with `JSX.IntrinsicElements`, there's no extra type information (ex: list of valid props) associated with it. Longer term, it might make sense for `@types/react-native` to add native component types like `RCTView` to `JSX.IntrinsicElements` and go back to using `React.ReactType<'RCTView'>` with `requireNativeComponent`, but this is a disruptive change.
Test plan: Ran tests, verified they pass again.
Fixes#30958.