Animated: Defer `onAnimatedValueUpdate` on Attach + Native (#48715)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/48715

{D68154908} fixed a problem with the `onAnimatedValueUpdate` listener not being correctly attached if `__attach` were called before `__makeNative` (which sets `__isNative` to true).

We're potentially seeing production symptoms of stuttering interactions and user responsiveness, after queuing up many operations. Our hypothesis is that in scenarios where `ensureUpdateSubscriptionExists` is being called during `__makeNative` (instead of during `__attach`), a backup of operations occurs leading to these symptoms.

This diff attempts to validate and mitigate this hypothesis by deferring `ensureUpdateSubscriptionExists` to when an `AnimatedValue` instance has had both `__attach` and `__makeNative` invoked.

Changelog:
[Internal]

Differential Revision: D68236594

fbshipit-source-id: 2089100a773ebfc161fb5b567123eb58a893939f