SKOPJE, Macedonia — The construction cranes, heavy machinery and plumes of dust in Skopje’s city center herald the final chapter in one of the Balkans’ saddest tales. After years of delays, Macedonia’s Jews are building a world-class museum to remember their near-extinction in the Holocaust. “The highest percentage of Jews destroyed anywhere in the world — including Poland — was in Macedonia,” said Rahamin Mizrahi, vice president of the Jewish Community, a nonprofit overseeing the project. “It was 98 percent of the Jews. From our people, no one came back.