The legendary mob boss from “The Sopranos” is back in “The Many Saints of Newark,” a prequel to the HBO series that focuses on the early years of Tony and his close relationship with Dickie Moltisanti, the father of Michael Imperioli’s Christopher Moltisanti. Tony, or at least his teenage iteration, is front-and-center in a new trailer for “The Many Saints of Newark,” which dropped on Tuesday. And he’s played by Michael Gandolfini, the son of the late “Sopranos” star James Gandolfini, who died in 2013.