Are genre films set to overtake the Cannes Film Festival like a zombie horde? As with the ominous music before a jump scare, things certainly seem to be trending in that direction. Two years after Coralie Fargeat’s grotesque, feminist fantasia “The Substance” shocked the Croisette and one year after Julia Ducournau ’s body horror “ Alpha ” (following her equally gory, 2021 Palme winner “Titane”) and Ari Aster’s paranoid Western thriller “Eddington” vied for the festival’s top honors, this year’s line-up is stacked with genre titles like, well, bodies in a morgue.  Across its various sections, the 79th Cannes festival features more than a dozen films that venture from science fiction to the supernatural to high-grade schlock and gore.…