It’s been eight years since U.S. Marshal Raylan Givens (Timothy Olyphant) packed up his Stetson hat and moved down to Miami in the series finale of FX’s consistently excellent “Justified.” (Although it’s 15 years in the world of the show.) As if he’s never left, he glides back into the television landscape this month with “Justified: City Primeval,” an eight-episode limited series that adapts Elmore Leonard’s 1980 book, “City Primeval: High Noon in Detroit,” into a new standalone story.