Warner Bros. Studios in Burbank, Calif., on Feb. 27, 2026. Paramount’s acquisition of Warner Bros. was scheduled to be completed in the third quarter this year. (Mark Abramson/The New York Times) By BENJAMIN MULLIN, DAVID McCABE and LAUREN HIRSCH A coalition of 12 Democratic states including California, New York and Washington filed a lawsuit earlier this week to block Paramount’s $111 billion acquisition of Warner Bros. Discovery, the most serious legal challenge to date for one of the…