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/registry/backgroundsvcs/background_services.go

@@ -20,7 +20,6 @@ import (
 	"github.com/grafana/grafana/pkg/services/dashboards/service"
 	"github.com/grafana/grafana/pkg/services/dashboardsnapshots"
 	"github.com/grafana/grafana/pkg/services/grpcserver"
-	"github.com/grafana/grafana/pkg/services/guardian"
 	ldapapi "github.com/grafana/grafana/pkg/services/ldap/api"
 	"github.com/grafana/grafana/pkg/services/live"
 	"github.com/grafana/grafana/pkg/services/live/pushhttp"
@@ -73,7 +72,7 @@ func ProvideBackgroundServiceRegistry(
 	dashboardServiceImpl *service.DashboardServiceImpl,
 	// Need to make sure these are initialized, is there a better place to put them?
 	_ dashboardsnapshots.Service,
-	_ serviceaccounts.Service, _ *guardian.Provider,
+	_ serviceaccounts.Service,
 	_ *sanitizer.Provider,
 	_ *grpcserver.HealthService, _ *grpcserver.ReflectionService,
 	_ *ldapapi.Service, _ *apiregistry.Service, _ auth.IDService, _ *teamapi.TeamAPI, _ ssosettings.Service,