SYDNEY — Australia is confronting one of its darkest moments in decades after a deadly shooting at a Hanukkah celebration on Sydney’s Bondi Beach, an attack Prime Minister Anthony Albanese has condemned as an act of antisemitism and terrorism. According to police, 15 people — including a 10-year-old girl — were killed when gunmen opened fire during the Jewish community event on Sunday evening. Authorities say mass shootings remain extremely rare in Australia, making the Bondi attack the country’s deadliest since the 1996 Port Arthur massacre, a tragedy that reshaped national gun policy. “This was a targeted act of hatred,”…