Forgive us ifthis one sounds familiar: Jersey City has been ordered by a state hearing board to reinstate police officers who were fired for legal cannabis use. The city remains winless in its quixotic quest to bar police officers from using cannabis while off-duty after Wednesday’s identical rulings in the cases of Norhan Mansour and Omar Polanco, among the first officers to be disciplined by the city for testing positive for the drug that was legalized in 2020. The city had appealed previous decisions by the Office of Administrative Law and the Civil Service Commission that the officers were…