BEIJING—The Russian coach of the 15-year-old figure skater embroiled in an Olympic doping scandal broke her silence to defend Kamila Valieva on Saturday, while the sport’s highest court said it would hold a hearing on Valieva’s Winter Games future on Sunday. Coach Eteri Tutberidze said she was certain Valieva was “clean and innocent” in an interview with Russian state television after hugging her figure-skating prodigy, who trained again at the rink next to the Capital Indoor Stadium on Saturday afternoon. Valieva’s future at the Winter Games will be decided by Monday afternoon Beijing time, after a hearing by the Court of Arbitration for Sport (CAS) on Sunday, CAS said in a statement on Saturday. The figure skater’s Olympics hangs in the balance after the revelation that she had tested positive for a banned heart drug before winning the team event on Monday, but it took more than six weeks before …