HONG KONG, May 29 (Reuters) - A Hong Kong Court on Monday rejected an application to terminate a landmark national security trial against media tycoon Jimmy Lai, a case that could see him spend the rest of his life in prison if convicted. Jimmy Lai, 75, is the founder of now shut pro-democracy newspaper Apple Daily and one of the most prominent Hong Kong critics of China's Communist Party leadership, including President Xi Jinping. Lai and his three companies, Apple Daily Limited, Apple Daily Printing Limited, AD Internet Limited faced a total of three charges under the national security law,...