After a week marred by his party’s rout in European elections, German Chancellor Olaf Scholz drew a literal chorus of much-needed support from G7 leaders at their summit in southern Italy on Friday. Before the working session on migration, US President Joe Biden led the leaders of the world’s advanced industrialized democracies in a rendition of Happy Birthday as Scholz turned 66, according to the German delegation. EU Commission President Ursula von der Leyen was also present at the impromptu digression from business in the coastal city of Bari. At midnight Thursday, Scholz, who is accompanie…