WASHINGTON—Congress will formally certify President-elect Donald Trump’s victory in the 2024 election on Jan. 6, marking the final ceremonial step to confirm Trump as the next commander-in-chief. Vice President Kamala Harris, as president of the Senate, will officiate the certification during a joint session of Congress and declare her erstwhile rival the winner in the presidential contest. It’s expected to be largely a quiet, formal process this year. Harris has said she intends to treat her role as ceremonial. Democrats in Congress have already made clear that they accept Trump’s win. For members of both parties, the day can’t help but recall the events that unfolded four years prior….