AccessControl: Enable RBAC by default (#48813)

* Add RBAC section to settings

* Default to RBAC enabled settings to true

* Update tests to respect RBAC

Co-authored-by: Karl Persson <kalle.persson@grafana.com>

pkg/services/sqlstore/sqlstore.go

@@ -487,6 +487,7 @@ func initTestDB(migration registry.DatabaseMigrator, opts ...InitTestDBOpt) (*SQ
 
 		// set test db config
 		cfg := setting.NewCfg()
+		cfg.RBACEnabled = true
 		cfg.IsFeatureToggleEnabled = func(key string) bool {
 			for _, enabledFeature := range features {
 				if enabledFeature == key {