Permissions: Show plugins in nav for non admin users but hide plugin configuration (#18234)

Allow non admins to see plugins list but only with readme. Any config tabs are hidden from the plugin page. Also plugin panel does not show action buttons (like Enable) for non admins.

(cherry picked from commit 7f1214ac46)

pkg/api/index.go

@@ -307,6 +307,25 @@ func (hs *HTTPServer) setIndexViewData(c *m.ReqContext) (*dtos.IndexViewData, er
 			}
 		}
 
+		data.NavTree = append(data.NavTree, cfgNode)
+	} else {
+		cfgNode := &dtos.NavLink{
+			Id:       "cfg",
+			Text:     "Configuration",
+			SubTitle: "Organization: " + c.OrgName,
+			Icon:     "gicon gicon-cog",
+			Url:      setting.AppSubUrl + "/plugins",
+			Children: []*dtos.NavLink{
+				{
+					Text:        "Plugins",
+					Id:          "plugins",
+					Description: "View and configure plugins",
+					Icon:        "gicon gicon-plugins",
+					Url:         setting.AppSubUrl + "/plugins",
+				},
+			},
+		}
+
 		data.NavTree = append(data.NavTree, cfgNode)
 	}