Congress has passed a $2 trillion rescue plan but before those funds start to flow, American companies from the owner of a single liquor store in Boston to corporate giants like Macy’s Inc., must decide what to do about April’s bills: Which obligations do they pay and which can they put off? How many employees can they afford to keep on the payroll? Can they get a break on rent? The decisions they make this week could shape how deeply the economy is damaged by the coronavirus pandemic. …