BEIJING—Russian figure skater Kamila Valieva’s right to compete in the women’s event at the Beijing Olympics will be decided at an urgent hearing at the Court of Arbitration for Sport (CAS). The International Testing Agency (ITA)—on behalf of the International Olympic Committee (IOC)—said Friday it would fight a decision by Russia’s anti-doping agency to allow the 15-year-old Valieva to skate. The Russian agency had provisionally banned Valieva this week because she failed a doping test in December. Valieva is the heavy favorite in her event which begins Tuesday after setting world record scores this season and landing the first quad jump by a women at an Olympics. The ITA confirmed reports that Valieva tested positive for the banned substance trimetazidine at the Russian national championships in St. Petersburg six weeks ago. The positive test was flagged by a laboratory in Sweden only on Tuesday—the day after Valieva helped the Russians …