By Angie Teo and Iain Axon BEIJING (Reuters) – The Court of Arbitration for Sport (CAS) has concluded its hearing on Russian figure skater Kamila Valieva after she tested positive for a banned drug and a final decision on the teenager will be announced later on Monday after deliberations. The 15-year-old prodigy, who became the first woman to land a quadruple jump at the Olympics en route to winning gold with the Russian Olympic Committee (ROC) in the team competition, tested positive for a banned heart drug on Dec. 25 but it took more than six weeks for the result to be made public. Her futur…