Fixes Image load event in new arch (#44918)

Summary:
Fixes #44896. cc cipolleschi

## Changelog:

[IOS] [FIXED] - Fixes Image load event in new arch

Pull Request resolved: #44918

Test Plan: #44896

Reviewed By: dmytrorykun

Differential Revision: D59108500

Pulled By: cipolleschi

fbshipit-source-id: 1fad4f82288141e9fc37f525be7073deb81c542c

packages/react-native/React/Fabric/Mounting/ComponentViews/Image/RCTImageComponentView.mm

@@ -136,7 +136,10 @@ - (void)didReceiveImage:(UIImage *)image metadata:(id)metadata fromObserver:(con
     return;
   }
 
-  static_cast<const ImageEventEmitter &>(*_eventEmitter).onLoad(_state->getData().getImageSource());
+  auto imageSource = _state->getData().getImageSource();
+  imageSource.size = {image.size.width, image.size.height};
+
+  static_cast<const ImageEventEmitter &>(*_eventEmitter).onLoad(imageSource);
   static_cast<const ImageEventEmitter &>(*_eventEmitter).onLoadEnd();
 
   const auto &imageProps = static_cast<const ImageProps &>(*_props);