ACAPULCO, Mexico — Below the shattered windows of the high-rise hotels in downtown Acapulco, people walk alongside towering hills of garbage bags filled with rotting food and debris, from mattresses to Christmas decorations. Volunteer firefighters from distant states clear the waste, wiping away swarms of cockroaches from their arms. Miles from the coastal beachside resorts, Elizabeth Del Valle, 43, listened as her teenage daughter Constanza Sotelo described the “mountains of trash” still blocki