Big Oil is reaping near record cash windfalls from the eight-month-old Iran war, but Western energy producers’ reluctance to ramp up spending reveals persistent doubts about the industry’s long-term outlook.BP, Chevron, Exxon Mobil, Shell and TotalEnergies reported combined net profits of $56 billion in the third quarter, driven by surging oil and gas prices, record-high refining margins and strong trading results…