[Layout Animations][iOS] Fix registering exiting view ancestors #3849
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Summary
#3824 introduces a bug with how we register ancestors of views with
exiting
animations.When a tree with
exiting
views is reattached to the native view hierarchy, we don't register the ancestors of that tree as ancestors of exiting subviews. This may cause issues with deleting these views early, while there're stillexiting
animations running inside them.Test plan