Magic mirror on the wall, show us the story that started it all. From the producer and executive producer of “Wicked,” Marc Platt and Jared LeBoff, and director Marc Webb (“The Amazing Spider-Man”) comes “Disney’s Snow White,” a live-action musical reimagining of the studio’s classic 1937 film. The magical music adventure journeys back to the timeless story with Rachel Zegler (“West Side Story”) in the title role and Gal Gadot (“Wonder Woman”) as her Stepmother,…