Paramount's Grease prequel Summer Lovin' is an unholy project. You know it. I know it. I think we all know it. Except, of course, for a handful of executives at Paramount Pictures, the studio that has been selling itself to Netflix one movie at a time over the last few months. Paramount is pressing forward on the ill-advised project, tapping Hearts Beat Loud helmer Brett Haley to direct from a script by Leah McKendrick. Haley is actually a strong hire for a movie like this, as he has actual chops and can generate real emotion onscreen. He also …