Search v1: Remove unnecessary subqueries (#72388)

* Add feature flag

* Introduce interface and dummy implementation

* Add tests for the new filter

* accessControlDashboardPermissionFilterNoFolderSubquery implementation

* join only if it's necessary

* force ordering for tests

* Temporarily enable new query for benchmarks

packages/grafana-data/src/types/featureToggles.gen.ts

@@ -115,6 +115,7 @@ export interface FeatureToggles {
   awsAsyncQueryCaching?: boolean;
   splitScopes?: boolean;
   azureMonitorDataplane?: boolean;
+  permissionsFilterRemoveSubquery?: boolean;
   prometheusConfigOverhaulAuth?: boolean;
   configurableSchedulerTick?: boolean;
 }