Public Dashboards: Add audit table (#54508)

This PR adds an audit table for public dashboards allowing a user to view all public dashboards on an instance of grafana. The public dashboards team is working on a proposal for adding RBAC support to the audit table for 9.3

Co-authored-by: juanicabanas <juan.cabanas@grafana.com>

pkg/services/navtree/navtreeimpl/navtree.go

@@ -381,6 +381,15 @@ func (s *ServiceImpl) buildDashboardNavLinks(c *models.ReqContext, hasEditPerm b
 			Url:      s.cfg.AppSubURL + "/library-panels",
 			Icon:     "library-panel",
 		})
+
+		if s.features.IsEnabled(featuremgmt.FlagPublicDashboards) {
+			dashboardChildNavs = append(dashboardChildNavs, &navtree.NavLink{
+				Text: "Public dashboards",
+				Id:   "dashboards/public",
+				Url:  s.cfg.AppSubURL + "/dashboard/public",
+				Icon: "library-panel",
+			})
+		}
 	}
 
 	if s.features.IsEnabled(featuremgmt.FlagScenes) {