Fast-rising and BAFTA-nominated Irish star Éanna Hardwicke (“The Sixth Commandment,” “Lakelands”) is set to play Manchester United and Ireland soccer legend Roy Keane in upcoming Irish feature “Saipan,” Variety can reveal. Hardwicke will be joined by two-time Oscar nominee Steve Coogan (“Philomena,” “The Reckoning”), who will star as Mick McCarthy, the former Ireland…