dillon1000/react

Throttle retries even if everything has loaded (#26611)

If a Suspense fallback is shown, and the data finishes loading really
quickly after that, we throttle the content from appearing for 500ms to
reduce thrash.

This already works for successive fallback states (like if one fallback
is nested inside another) but it wasn't being applied to the final step
in the sequence: if there were no more unresolved Suspense boundaries in
the tree, the content would appear immediately.

This fixes the throttling behavior so that it applies to all renders
that are the result of suspended data being loaded. (Our internal jargon
term for this is a "retry".)