A Study Comparing Navlimetostat (BMS-986504) in Combination With Nab-paclitaxel and Gemcitabine Versus Placebo in Combination With Nab-paclitaxel and Gemcitabine in Participants With Untreated Metastatic Pancreatic Ductal Adenocarcinoma With Homozygous MTAP Deletion (MountainTAP-30)