dillon1000/react

offscreen double invoke effects (#19523)

This PR double invokes effects in __DEV__ mode.

We are thinking about unmounting layout and/or passive effects for a hidden tree. To understand potential issues with this, we want to double invoke effects. This PR changes the behavior in DEV when an effect runs from create() to create() -> destroy() -> create(). The effect cleanup function will still be called before the effect runs in both dev and prod. (Note: This change is purely for research for now as it is likely to break real code.)

**Note: The change is fully behind a flag and does not affect any of the code on npm.**