Saudi Arabia's sovereign wealth fund is seriously considering an investment in electric-luxury-car start-up Lucid Motors, according to a Reuters report.That's significant for a few reasons, starting with this one: Tesla (NASDAQ: TSLA) CEO Elon Musk has been looking to the Saudi fund for financial support in his effort to take Tesla private.Is the fund's interest in Lucid a sign that it's edging away from a deal with Tesla?