Tiffany Haddish is finally stepping into the biopic bracket. The ‘Girls Trip’ actress will play the late Florence Griffith Joyner, the American track and field athlete rated the fastest woman of all time. According to Variety, Haddish will star in and also produce alongside Game1 Co-CEOs Basil Iwanyk and Greg Economou. Florence’s widower and former coach, Al Joyner is also …