Even among the lofty realm of golden parachutes, Warner Bros. Discovery Chief Executive David Zaslav’s proposed payday stands out. Zaslav, one of the most richly compensated executives in America, is poised to receive as much as $887 million to depart the company once it is absorbed by David Ellison’s Paramount Skydance, Warner Bros. Discovery disclosed in a recent proxy statement. That amount “represents one of the highest golden parachute estimates ever observed,” investor advisory firm Institutional Shareholder Services wrote in a report this week. “Support for the golden parachute proposal is not warranted.” Warner shareholders on April 23 will vote on the company’s $111-billion sale to Ellison’s Paramount — a meaningful mark as Ellison and his team race to line up the approvals for the industry reshaping deal, which they hope to finalize this summer. That vote is binding. The acquisition is expected to trigger substantial layoffs and other cost cuts as the new owners consolidate two legendary studios and TV operations, including dozens of cable channels. Stockholders also will be asked to weigh in …