This commit ensures that the `updateValueAndValidity` method takes the
`asyncValidator` into consideration to emit on the `statusChanges` observables.
This is necessary so that any subsequent changes are emitted properly to any
subscribers.
Closes#20424Closes#14542
BREAKING CHANGE:
Previously if FormControl, FormGroup and FormArray class instances had async validators
defined at initialization time, the status change event was not emitted once async validator
completed. After this change the status event is emitted into the `statusChanges` observable.
If your code relies on the old behavior, you can filter/ignore this additional status change
event.
PR Close#38354