“Skittish” isn’t an adjective ascribed toBridget Everett, whose envelope-pushing, larger-than-life cabaret performances have made her a New York icon. But when the singer, actress and comedian landed a plum role in “Patti Cake$,” the Sundance Film Festivalsmash that hits theaters today, her nerves almost got the better of her. “I honestly didn’t know if I was going to be able to do it,” Everett, 45, told HuffPost.