By Tania Ganguli and Jonathan Abrams Her face is on hoodies. Her name is in hashtags. Her “BG” and number are on fans’ jerseys and WNBA courts. As Phoenix Mercury star Brittney Griner waits in Russia, detained since Feb. 17 on drug charges, symbols of support for her are all around. They come from people who don’t know her at all and people who know and love her — from teammates, sympathizers and former coaches. Dawn Staley, who coached Griner and her U.S. teammates to a gold