Has all the applause gotten out of hand? At this year’s Venice Film Festival, which ends on Saturday, three movies so far have received standing ovations reported to last 15 minutes or more. Mamma mia! The wildest responses have gone to “Smashing Machine,” starring Dwayne “The Rock” Johnson as MMA fighter Mark Kerr; “The Testament of Ann Lee,” a historical musical with Amanda Seyfried; and Guillermo del Toro’s “Frankenstein,” with rising star…