Celtic had to show conviction under pressure yesterday afternoon to progress to the Scottish Cup final at the expense of Aberdeen. Bojan Miovski sprung the trap early to put Aberdeen ahead, though Nicolas Kuhn’s close-range finish swiftly pegged back the Dons and concluded the first half scoring. Rolling back the years, James Forrest made an immediate impression off the bench on 63 minutes, jinking inside before curling past Kelle Roos into the bottom corner to give Brendan Rodgers’ men the advantage. Nevertheless, penalty madness ensued after Ester Sokler and Angus MacDonald’s headers were sa…