PARIS — French conservative leader Bruno Retailleau has been endorsed by members of his party, Les Républicains, to run in next year’s already crowded race to succeed President Emmanuel Macron. Retailleau, who had already declared his intention to run in the presidential election, won his party’s official backing after members were internally surveyed to determine whether they preferred to hold a primary to select a candidate, or back Les Républicains’ leader outright. More than 73 percent of