MODENA, Italy—Australian Caleb Ewan sprinted to victory but one of the main GC favorites Mikel Landa’s race is over after a crash-hit climax to stage five of the Giro d’Italia on Wednesday. Lotto Soudal rider Ewan surged through to beat Italian Giacomo Nizzolo on the line alongside the Adriatic resort of Cattolica with Elia Viviani…