Remove dead updateLayout JS→native bridge path

Now that both platforms observe content height natively (iOS via KVO,
Android via OnLayoutChangeListener), the JS-callable updateLayout()
is unused. Remove:

- updateLayout() and prevLayoutDetentIdentifier from iOS SheetView
- AsyncFunction("updateLayout") from both platform module definitions
- updateLayout method from the JS BottomSheetNativeComponent

Android's updateLayout() is kept as a private implementation detail
since the keyboard insets listener and native layout observer both
call it internally.

https://claude.ai/code/session_01Rp7ef1h3fKh6fhStcjqLJ5

modules/bottom-sheet/src/BottomSheetNativeComponent.tsx

@@ -71,10 +71,6 @@ export class BottomSheetNativeComponent extends React.Component<
     this.props.onStateChange?.(event)
   }
 
-  private updateLayout = () => {
-    this.ref.current?.updateLayout()
-  }
-
   static dismissAll = async () => {
     await NativeModule.dismissAll()
   }