The current implementation of the dialog's `finishDialogOpen`, which
includes autofocus, only waits for a microtask before executing. This
only works in the tests because of the synchronous call to
`detectChanges` after opening the dialog, ensuring that change detection
runs before the microtask. In an application, this is not guaranteed
because `NgZone` will only run change detection when the microtask queue
empties, which includes the microtask created by the dialog container.

This commit updates the implementation to wait for the next render to
coplete, _then_ queues a microtask that will finish the open process and
perform autofocus.

…omplete