Fiat Chrysler Automobiles NV said it is temporarily halting production at a car factory in Serbia because it can’t get parts from China, a sign of how the coronavirus outbreak is creating a domino effect in a straining global supply chain. At the same time, union officials at two major General Motors Co. factories in the U.S. are warning more production outages could come as certain parts at SUV and truck plants in Michigan and Texas run low. …