WASHINGTON — The Justice Department is stepping up its enforcement of hate crimes and other bias-related incidents, furthering a promise by Attorney General Merrick Garland to focus on civil rights violations.Assistant Attorney General Kristen Clarke, recently sworn in and the first Black woman to hold the position, said the effort has led to indictments in multiple cases over the past six months. But the number of hate crimes has grown: In November, the FBI said they’d reached the highest level in more than a decade …