dillon1000/react

Test for suspending with modern strict mode (#28513)

## Overview

Adds a test to show the cause of an infinite loop in Relay related to
[these effects in
Relay](https://github.com/facebook/relay/blob/448aa67d2a11e7d45cd7b4492b9f599b498cb39e/packages/react-relay/relay-hooks/useLazyLoadQueryNode.js#L77-L104)
and `useModernStrictMode`. The bug is related to effect behavior when
committing trees that re-suspend after initial mount.

With `useModernStrictEffect`, when you:
- initial mount
- update
- suspend (to fallbacks)
- resolve
- re-commit

We fire strict effects during the second mount, like it's a new tree.
This creates weird cases, where if there was an update while we
suspended, we'll first fire only the effects that changed dependencies,
and then fire strict effects.

Creating a test to demonstrate the behavior to see if it's a bug.