TV and film leading man Kevin Costner divulged this week that when he gave the eulogy at Whitney Houston’s 2012 funeral he rebuffed CNN when the idea was floated that he should shorten his remarks, so the network could cash in on ads. The “Yellowstone” star, who starred alongside Houston in the 1992 smash hit film “The Bodyguard,” said he didn’t care about the network’s bottom line. During an interview on Dax Shepard’s podcast “Armchair Expert,” the subject of his and Whitney’s film and Costner’s lengthy eulogy came up. Costner, who became lifelong friends with Houston after the film came out,…