Adva Lavie's alleged luxury dating scheme has taken a startling turn, with billionaire businessman and former California gubernatorial candidate Stephen Cloobeck now facing a witness-tampering charge linked to the case involving his former fiancée. Lavie, a Los Angeles model and social media personality also known by names including Mia Ventura, Shoshana, and Shana, is accused of using romantic relationships to gain access to wealthy people befo…