WASHINGTON — A Texas man was convicted Tuesday of storming the U.S. Capitol with a holstered handgun, a milestone victory for federal prosecutors in the first trial among hundreds of cases arising from last year’s riot.A jury also convicted Guy Wesley Reffitt of interfering with police officers who were guarding the Capitol on Jan. 6, 2021, and of obstructing justice for threatening his two teenage children if they reported him to law enforcement after the attack. Jurors deliberated about three hours and convicted him on …