The Knicks aren’t the only lousy thing at Madison Square Garden — the Garden’s hiring practices are awful as well, according to a new class action lawsuit. In fact, the place that calls itself “The World’s Most Famous Arena” habitually discriminates against job applicants with criminal records such as misdemeanors, the suit says. Clint Millien says in a lawsuit to be filed in Manhattan Supreme Court Wednesday that MSG rescinded its offer for a food prep job after he failed a background check due to two misdemeanor convictions when he was 19 years old. “Why is it still biting me in the ass?”...