mock setIsJSResponder

Author: JoshuaGross

packages/react-native-renderer/src/__mocks__/react-native/Libraries/ReactPrivate/InitializeNativeFabricUIManager.js

@@ -176,6 +176,7 @@ const RCTFabricUIManager = {
     );
     success(1, 1, 100, 100);
   }),
+  setIsJSResponder: jest.fn(),
 };
 
 global.nativeFabricUIManager = RCTFabricUIManager;