RBAC: Remove dashboard and folder guardians (#104646)

* replace usage of folder guardians with access control evaluators

* remove NewByFolderUID guardian

* bring up to date

* fix test

* more test fixes, and don't fetch the folder before evaluating lib element access

* change what error is returned

* fix alerting test

* try to fix linter errors

* replace the use of newByFolder guardian with direct access control evaluator checks

* remove newByFolder guardian

* get rid of dashboard and folder guardians

* undo unwanted change

* undo unwanted change

* undo unwanted change

* update code owners

pkg/services/ngalert/api/api_provisioning_test.go

@@ -35,7 +35,6 @@ import (
 	"github.com/grafana/grafana/pkg/services/folder"
 	"github.com/grafana/grafana/pkg/services/folder/folderimpl"
 	"github.com/grafana/grafana/pkg/services/folder/foldertest"
-	"github.com/grafana/grafana/pkg/services/guardian"
 	ac "github.com/grafana/grafana/pkg/services/ngalert/accesscontrol"
 	"github.com/grafana/grafana/pkg/services/ngalert/accesscontrol/fakes"
 	"github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions"
@@ -2021,11 +2020,6 @@ func createTestEnv(t *testing.T, testConfig string) testEnvironment {
 			},
 		*/
 	}
-	origNewGuardian := guardian.New
-	guardian.MockDashboardGuardian(&guardian.FakeDashboardGuardian{CanSaveValue: true, CanViewValue: true})
-	t.Cleanup(func() {
-		guardian.New = origNewGuardian
-	})
 
 	parent, err := folderService.Create(context.Background(), &folder.CreateFolderCommand{
 		OrgID:        1,