fix rctimage observer crash when unloading with events in-flight (#55135)
Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/55135
Resolves a rare native iOS ImageResponseObserverCoordinator crash that would result from a use-after-free in the observer.
## Changelog:
[iOS] [Fixed] - Resolves a rare race-condition that can trigger in RCTImageComponentView.
## Original Error
EXC_BAD_ACCESS / KERN_INVALID_ADDRESS in ImageResponseObserverCoordinator::nativeImageResponseProgress
Reviewed By: fkgozali, javache
Differential Revision: D90552795
fbshipit-source-id: 30f62b151664161c408667d27c7bb6b69ee2bd67