Move over Messi — there’s a new canine thespian in town. Ukai, the Australian shepherd/ border collie/bouvier mix who stars opposite Mark Wahlberg in the new film “Arthur the King,” undertakes a performance that is more physically rigorous, if not dramatically suspenseful, than the one delivered by the French border collie who appeared in the Oscarwinning film “Anatomy of a Fall.” But dog movies…