BarChart: make sure tooltip closes when user presses E (#34884) (#34941)

(cherry picked from commit dfc466052d)

Co-authored-by: Oscar Kilhed <oscar.kilhed@grafana.com>

packages/grafana-ui/src/components/uPlot/plugins/TooltipPlugin.tsx

@@ -56,6 +56,7 @@ export const TooltipPlugin: React.FC<TooltipPluginProps> = ({
     }
 
     return () => {
+      setCoords(null);
       if (plotCtx && plotCtx.plot) {
         plotCtx.plot.over.removeEventListener('mouseleave', plotMouseLeave);
       }