Pressability: Setup Insertion Effect Experiment (#54292)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/54292

Sets up a feature flag to experiment with using `useInsertionEffect` in `Pressability`, instead of `useEffect.

Using `useInsertionEffect` enables `Pressability` to behave more predictability in component trees with `<Activity mode="hidden">` because the events are scheduled more similarly to platform controls (e.g. focus and blur events will still fire even when "hidden").

Changelog:
[Internal]

Reviewed By: javache

Differential Revision: D85612742

fbshipit-source-id: c2faab25bfcf7f964521e680eb3c4132c1087ef4