WASHINGTON — Two of Labor Secretary Lori Chavez-DeRemer’s top aides have resigned amid an ongoing probe of possible misconduct by officials in the Labor Department, according to a department official and another source familiar with the matter. Chavez-DeRemer’s chief of staff, Jihun Han, and his deputy, Rebecca Wright, had been placed on administrative leave in mid-January while the Labor Department’s inspector general investigates possible “travel fraud.” The staffers were given 24 hours to