Daniel D'Addario Chief TV CriticPerhaps the only gratifying thing about Rudy Giuliani’s appearance on “The Masked Singer” is that the element of surprise the show’s producers craved was ruined in advance.Wednesday night’s episode of “The Masked Singer” saw former New York City mayor and lawyer for former President Donald Trump revealed as the Jack in the Box. Fitting his costume, the disguised Giuliani explosively popped out of his captivity to perform George Thorogood and the Destroyers’ “Bad to the Bone” after a dancer turned his crank, to squeals of delight from the show’s audience and judges.