The head of Chicago’s largest police union officially submitted his paperwork to retire from the police department on Tuesday, after saying he would rather leave the force than go through with a disciplinary hearing that he called a “farce.”John Catanzara said he would remain president of the Fraternal Order of Police Lodge 7 and that he plans to run for mayor against Mayor Lori Lightfoot, with whom he has engaged in a bitter war of words over a host of issues. Most recently, the two battled over …