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[Fabric] Pass children when cloning (#27458)
## Summary Currently when cloning nodes in Fabric, we reset a node's children on each clone, and then repeatedly call appendChild to restore the previous list of children (even if it was quasi-identical to before). This causes unnecessary invalidation of the layout state in Fabric's ShadowNode data (which in turn may require additional yoga clones) and extra JSI calls. This PR adds a feature flag to pass in the children as part of the clone call, so Fabric always has a complete view of the node that's being mutated. This feature flag requires matching changes in the react-native repo: facebook/react-native#39817 ## How did you test this change? Unit test added demonstrates the new behaviour ``` yarn test -r www-modern ReactFabric-test yarn test ReactFabric-test.internal ``` Tested a manual sync into React Native and verified core surfaces render correctly. DiffTrain build for [151e75a](151e75a)
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