Saturday’s Scottish Cup Final between Celtic and Rangers will be Joe Hart’s last as a professional footballer, calling time on a trophy-laden career that saw him compete at the highest level. There’ll no doubt be a few dabbing their eyes at an emotional Hampden, win or lose, as Hart waves goodbye to a club and set of supporters he absolutely adores. Celtic are already planning for a successor. They have been linked with multiple shot-stoppers at home and abroad in recent months including Arijanet Muric and Ugurcan Cakir. It will be far from easy to replace Hart’s presence and personality after…