`waiter.nextToken` needs to be added to the production Noop waiter

[runspired]

the only way to pass a label to beginAsync is to also pass a token yourself, meaning:

waiter.beginAsync(waiter.nextToken(), myLabel)

in production builds this will throw because the no-op waiter does not stub this function

[NullVoxPopuli]

any chance you'd be willing to add a separate test app here: https://github.com/emberjs/ember-test-waiters/tree/master/test-apps

that tests and asserts production behavior?