Jody Serrano and Matías S. Zavia

BARCELONA, Spain — Gerard Piqué’s Kings League, a new soccer league that just three months ago debuted to jokes and scorn, came to a glorious, dramatic finish in FC Barcelona’s famous Camp Nou stadium on Sunday. As Piqué handed the glittering gold trophy to the winner, Adri Contreras’ “El Barrio,” a perpetual underdog whose team…