A federal judge late Friday put a hold on the $6.2 billion merger between Nexstar Media Group and Tegna, a deal that would create the largest operator of local television stations in the country. U.S. District Judge Troy L. Nunley in California granted a request from DirecTV, which argued in a lawsuit that the pending merger violates federal antitrust laws. Eight attorneys general, led by California’s Rob Bonta, filed a separate lawsuit on similar legal grounds. “Plaintiff asserts Nexstar’s