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/migrations/migrations.go

@@ -77,7 +77,7 @@ func (*OSSMigrations) AddMigration(mg *Migrator) {
 	addQueryHistoryMigrations(mg)
 
 	if mg.Cfg != nil && mg.Cfg.IsFeatureToggleEnabled != nil {
-		if mg.Cfg.IsFeatureToggleEnabled(featuremgmt.FlagAccesscontrol) {
+		if mg.Cfg.RBACEnabled {
 			accesscontrol.AddTeamMembershipMigrations(mg)
 			accesscontrol.AddDashboardPermissionsMigrator(mg)
 		}