Fix nightly builds (#2872)

# Summary

Fixes build issue with latest react-native nightlies by passing
`std::shared_ptr<RCTImageResponseObserverProxy>` to the
`observerCoordinator::removeObserver` and
`observerCoordinator::addObserver`. Interfaces of these methods were
changed in this
[commit](facebook/react-native@3b46755).
The fix is backward compatible with older versions of react native.

## Test Plan

Tested on latest react native nightly
`0.85.0-nightly-20260218-51dc568d2`.

Author: coado

apple/Elements/RNSVGImage.mm

@@ -122,14 +122,22 @@ - (void)_setStateAndResubscribeImageResponseObserver:(RNSVGImageShadowNode::Conc
 {
   if (_state) {
     auto &observerCoordinator = _state->getData().getImageRequest().getObserverCoordinator();
+#if REACT_NATIVE_MINOR_VERSION > 84
+    observerCoordinator.removeObserver(_imageResponseObserverProxy);
+#else
     observerCoordinator.removeObserver(*_imageResponseObserverProxy);
+#endif
   }
 
   _state = state;
 
   if (_state) {
     auto &observerCoordinator = _state->getData().getImageRequest().getObserverCoordinator();
+#if REACT_NATIVE_MINOR_VERSION > 84
+    observerCoordinator.addObserver(_imageResponseObserverProxy);
+#else
     observerCoordinator.addObserver(*_imageResponseObserverProxy);
+#endif
   }
 }