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/dashboards/database/database_test.go

@@ -21,7 +21,6 @@ import (
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	"github.com/grafana/grafana/pkg/services/folder"
 	"github.com/grafana/grafana/pkg/services/folder/folderimpl"
-	"github.com/grafana/grafana/pkg/services/guardian"
 	"github.com/grafana/grafana/pkg/services/org"
 	"github.com/grafana/grafana/pkg/services/search/model"
 	"github.com/grafana/grafana/pkg/services/search/sort"
@@ -863,17 +862,6 @@ func TestIntegrationFindDashboardsByTitle(t *testing.T) {
 		},
 	}
 
-	origNewGuardian := guardian.New
-	guardian.MockDashboardGuardian(&guardian.FakeDashboardGuardian{
-		CanSaveValue: true,
-		CanViewValue: true,
-		// CanEditValue is required to create library elements
-		CanEditValue: true,
-	})
-	t.Cleanup(func() {
-		guardian.New = origNewGuardian
-	})
-
 	f0, err := folderServiceWithFlagOn.Create(context.Background(), &folder.CreateFolderCommand{
 		OrgID:        orgID,
 		Title:        "f0",
@@ -983,17 +971,6 @@ func TestIntegrationFindDashboardsByFolder(t *testing.T) {
 		},
 	}
 
-	origNewGuardian := guardian.New
-	guardian.MockDashboardGuardian(&guardian.FakeDashboardGuardian{
-		CanSaveValue: true,
-		CanViewValue: true,
-		// CanEditValue is required to create library elements
-		CanEditValue: true,
-	})
-	t.Cleanup(func() {
-		guardian.New = origNewGuardian
-	})
-
 	f0, err := folderServiceWithFlagOn.Create(context.Background(), &folder.CreateFolderCommand{
 		OrgID:        orgID,
 		Title:        "f0",