NEW YORK — Lawyers for three Black NFL coaches alleging racial bias by the league took aim directly at Commissioner Roger Goodell on Wednesday in their latest arguments against arbitrating a dispute they say belongs before a jury.In papers filed in Manhattan federal court, the lawyers wrote that arbitration would allow “unconscionably biased one-sided ‘kangaroo courts’” to decide the outcome of the lawsuit filed in February by Brian Flores, who was fired in January as head coach of the Miami …