Access control: refactor RBAC checks (#48107) (#48164)

* refactor RBAC checks

* fix a test

* another test fix

* and another

(cherry picked from commit 68ca5b2e05)

Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>

pkg/api/folder_permission_test.go

@@ -44,6 +44,7 @@ func TestFolderPermissionAPIEndpoint(t *testing.T) {
 		dashboardService: service.ProvideDashboardService(
 			settings, dashboardStore, nil, features, permissionsServices,
 		),
+		AccessControl: accesscontrolmock.New().WithDisabled(),
 	}
 
 	t.Run("Given folder not exists", func(t *testing.T) {