Guardian: Introduce additional constructors (#59577)

* Guardian: Use dashboard UID instead of ID

* Apply suggestions from code review

Introduce several guardian constructors and each time use
the most appropriate one.

pkg/api/folder_test.go

@@ -240,6 +240,13 @@ func createFolderScenario(t *testing.T, desc string, url string, routePattern st
 			q := args.Get(1).(*models.GetDashboardACLInfoListQuery)
 			q.Result = aclMockResp
 		}).Return(nil)
+		dashSvc.On("GetDashboard", mock.Anything, mock.AnythingOfType("*models.GetDashboardQuery")).Run(func(args mock.Arguments) {
+			q := args.Get(1).(*models.GetDashboardQuery)
+			q.Result = &models.Dashboard{
+				Id:  q.Id,
+				Uid: q.Uid,
+			}
+		}).Return(nil)
 		store := mockstore.NewSQLStoreMock()
 		guardian.InitLegacyGuardian(store, dashSvc, teamSvc)
 		hs := HTTPServer{