For his new role, Taron Egerton went from gold hot pants to a prison jumpsuit. The 32-year-old actor, who has laid low since his Golden Globe-winning turn as Elton John in the 2019 biopic “Rocketman,” is back in front of the camera in Apple TV+’s “Black Bird,” playing a former high school hotshot and cop’s son who gets busted for dealing drugs to fuel his lavish lifestyle. The show also stars Ray Liotta, in one of his last projects before he died in his sleep in the Dominican Republic in late May. Facing 10 years behind bars at a minimum security prison, Jimmy Keene (Egerton) is instead offere…