NEW YORK CITY—Mayor Zohran Mamdani's (D.) highly touted "Rental Ripoff Hearing" went off the rails on Thursday as public housing advocates, who said City Hall was ignoring them, caused a scene outside the Brooklyn high school where the hearing took place. "I don't think that the mayor is prepared to be able to deal with [the New York City Housing Authority]," a man who identified himself as the Rev. Kevin McCall told the Washington Free Beacon . "I think he wants to sweep this under the rug and