Onstage at an Upfronts presentation on Wednesday, Warner Bros. Discovery ’s ad sales heads addressed the elephant in the room: This may be the company’s last such presentation, if their company’s $111 billion mega-merger with Paramount is consummated. Presidents of U.S. advertising sales Bobby Voltaggio and Ryan Gould addressed the topic early in the presentation at New York’s Theater at Madison Square Garden with a fake Freudian slip. “Good partnership is what drives us here at Warner Bros. Discovery, so before we go on, we do want to address the Ellison — I mean the elephant — in the room,” Voltaggio said. “Listen, we don’t deflect, that’s not who we are,” Gould added. “Everyone here knows that there’s change ahead and that there’s change at our company. But there’s change across the entire media industry. And we’re well aware that your business is changing, too.…