A new quarter of numbers is coming, but the long-term decision still hinges on where Tesla's profits will come from over the next few years.Tesla (TSLA 2.27%) reports results next month, and investors will be watching for evidence that the business is stabilizing after a significant pullback in vehicle sales trends. The electric vehicle (EV) maker sells premium cars, a growing suite of energy-storage products, and paid software for its vehicles, e.g., Tesla's Full Self-Driving (Supervised) software. The mix ...