SAN FRANCISCO — At the very bottom of baseball in stolen bases and plenty of other offensive categories, the Giants haven’t done much hitting or running, let alone in conjunction. Manager Tony Vitello put Jesus Rodriguez in motion Friday night, and Jung Hoo Lee slapped a splitter below the strike zone into the outfield grass. Rodriguez advanced first to third with ease. It was the kind of aggression the first-year manager has sought to snap his club out of its season-long struggle to get on the scoreboard. And, in appropriate fashion for the group so far, the effort produced exactly zero runs in the Giants’ 5-2 win over the Pirates . “Everyone’s kind of working their butt off to try to find any kind of edge,” Vitello said. “But ultimately you have to have a guy get on base.” San Francisco Giants shortstop Willy Adames (2) throws out Miami Marlins’ Otto Lopez at first base. AP Therein lies the truth: For the Giants to run, they have to walk. Or at least get on base.…