By Madeline Coleman Jaylen Brown said, “She’s been over there for an extended amount of time, and we feel like enough is enough.” Brittney Griner has been detained in Russia for more than 100 days, and players, coaches and teams across the country continue to find ways to support the WNBA star, the latest being the Celtics. Boston wore black and orange “We Are BG” shirts ahead of Saturday’s practice, a day before Game 2 of the NBA Finals. On the back was a QR code, which led to a Change.org petition—“Secure Brittney Griner’s Swift and Safe Return to the U.S.” “The shirts were super important b…