The man acquitted in the 2015 shooting of Kate Steinle on a San Francisco pier pleaded guilty to gun charges in federal court, nearly seven years after the 32-year-old’s death fueled a fiery debate about immigration and border control in the U.S. Jose Inez Garcia-Zarate pleaded guilty on Monday to being a felon in possession of a firearm and to being an alien unlawfully present in the country in possession of a firearm, officials said. Garcia-Zarate, an undocumented immigrant from Mexico, had been deported several times before he gunned down Steinle on July 1, 2015. She was strolling along Pie…