She was sidelined in “The Legend of Tarzan” and underused in “Suicide Squad,” but nobody’s going to forget Margot Robbie’s blazing performance in the figure-skating biopic “I, Tonya.” Profane, darkly funny, violent and truly tragic, Craig Gillespie’s film chronicles the uber-American story of Tonya Harding, the Olympic competitor who shot to worldwide notoriety after being...