BEIJING — A Chinese animated film about a mythical child with a punk attitude and superpowers has become China’s highest-grossing movie of all time, stoking national pride and potentially setting more records as it premieres overseas. “Ne Zha 2” has earned almost almost $1.3 billion in the two weeks since it was released in mainland China, according to the Chinese ticketing platform Maoyan. In addition to being the most successful film in Chinese box office history, it is the first non-Hollywood film to earn more than $1 billion and the first film in the world to earn more than $1...