For a show that’s designed to go horribly wrong, theater’s “Noises Off” does anything but that. “Noises Off” is a play within a play, chronicling the amazing failure of the play “Nothing On” and the increasingly absurd events that lead up to it. “Noises Off” takes place in three acts: the dress rehearsal, the backstage of the performance and the doomed show itself — each one more hilarious than the last.