RN: Always Flatten Animated Styles (#52268)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52268

Ships the feature flag introduced in https://github.com/facebook/react-native/pull/51719 to fix crahes that result from shadowed animated style values.

Changelog:
[General][Changed] - Animated now always flattens `props.style`, which fixes an error that results from `props.style` objects in which `AnimatedNode` instances are shadowed (i.e. flattened to not exist in the resulting `props.style` object).

Reviewed By: javache

Differential Revision: D77314904

fbshipit-source-id: b442d0256aee7a8925e28c7e87aee5e0a3f39425