Warner Bros. Discovery on Tuesday said it is open to a sale after receiving “unsolicited interest” from multiple parties — sending the media giant’s stock up more than 8% in early trading.The surprise announcement came as CEO David Zaslav expanded the company’s ongoing strategic review, confirming that the embattled entertainment giant will consider offers for all or part of the business.Zaslav said Warner Bros. Discovery, which owns HBO, CNN and the Warner Bros. studio, has been preparing to split into two ...