Update act

[rpiaggio]

Starting in React 18.3, act has been moved to React and deprecated in ReactTestUtils.

Also, this PR implements 3 methods in ReactTestUtils2:

• renderAsync, which invokes act(root.render(component)) asnychronouslly;
• actAsync(=> A) which is a convenience method for async act without the need of wrapping the action in an async effect;
• withRenderedAsync, which is an async version of withRendered.

This enables async testing with the pattern:

withRenderedAsync(comp()){ _ =>  // Mounts comp in root
  assert(...)
  for
    _ <- actAsync(Simulate.click(...))
    _ =  assert(...)
    _ <- actAsync(Simulate.click(...))
  yield assert(...)
}.map(_ => assert(...))          // After unmount

act will become fully async in the future. The current React docs read:

We recommend using act with await and an async function. Although the sync version works in many cases, it doesn’t work in all cases and due to the way React schedules updates internally, it’s difficult to predict when you can use the sync version.

We will deprecate and remove the sync version in the future.

Note: This PR subsumes #1105, since React 18.3 is needed.

[cquiroz]

nice 😄

[cquiroz]

LGTM