Fix native-driven props dropped on Animated.FlatList/SectionList under shared animated backend (#57178)

[zeyap]

Summary:

Changelog:

[Internal][Fixed] - Fix native-driven props dropped on Animated.FlatList/SectionList under shared animated backend

Under the shared animated backend (cxxNativeAnimatedEnabled + useSharedAnimatedBackend), a useNativeDriver: true animation on Animated.FlatList or Animated.SectionList (or any class composite that wraps a host) was silently dropped — e.g. an opacity fade never committed, so the content stayed at its initial value.

Root cause: AnimatedProps.#connectShadowNode resolves the target shadow node via getNodeFromPublicInstance(target.instance). FlatList/SectionList are class components (not forwardRef-to-host), so the ref is the composite instance, which has no __internalInstanceHandle; getNodeFromPublicInstance returns null and connectAnimatedNodeToShadowNodeFamily is never called. The C++ shared backend commits animated props only through a connected ShadowNodeFamily and has no viewTag fallback when useSharedAnimatedBackend is enabled, so the value is dropped. Animated.View and Animated.ScrollView are unaffected because their ref is the host instance; with cxxNativeAnimatedEnabled alone the legacy viewTag path still commits, so this only regresses once the shared backend is on.

Fix: in #connectShadowNode, resolve the shadow node from the host instance rather than the composite — try the instance, then getNativeScrollRef() (covers FlatList/SectionList), then fall back to the host tag that #connectAnimatedView already resolved via findNodeHandle, looked up natively with findShadowNodeByTag_DEPRECATED. The #connectAnimatedView viewTag path is unchanged.

Reviewed By: cipolleschi, javache

Differential Revision: D108155219

[meta-codesync]

@zeyap has exported this pull request. If you are a Meta employee, you can view the originating Diff in D108155219.