Gov. Gavin Newsom was seen cozying up Saturday with Fanatics boss Michael Rubin while A-listers abounded at the sports apparel billionaire’s bash at Pier 48 in San Francisco a day ahead of the Super Bowl. California’s governor is clearly enjoying the Super Bowl, having been spotted at several parties and concerts in the lead-up to the big game. In a video of Rubin’s soiree captured by The Post, the governor nearly bro-hugged the billionaire as they leaned in for an intimate chat. Rubin was also