Tesla (TSLA-Q) investors are anxious to know if plans to roll out a cheaper car and a robotaxi service this year are on track, and whether CEO Elon Musk is ready to ditch his role in the Trump administration soon and get back to managing the company more closely. The electric vehicle maker is scheduled after market close on Tuesday to provide what is likely to be its most important update on operations since the launch of its Model 3 vehicle in 2017. Tesla said earlier this month that it would “hold a live company update” along with its results…