By DEE-ANN DURBIN Albertsons is giving up on its merger with Kroger and it is suing the grocery chain, saying it didn’t do enough to secure regulatory approval for the $24.6 billion agreement. The move came the day after two judges halted the merger in separate court cases. U.S. District Court Judge Adrienne Nelson issued a preliminary injunction blocking the merger Tuesday after holding a three-week hearing in Portland, Ore.