Tesla shares hit their highest in nearly a year on Monday after CEO Elon Musk said the electric-vehicle maker was testing its robotaxis without safety monitors in the front passenger seat.While much of Tesla’s $1.53 trillion valuation — the highest of any automaker globally — is tied to investor optimism around its self-driving technology and humanoid robot ambitions, the bulk of its revenue and profit still comes from selling electric vehicles.Shares of the company rose as much as 4.9$481.37, th ...