Query library: requiresDevMode dummy backend (#56466)

* query library - dummy backend

* fix tests

* dont explicitly marshall backend dataresponse

* skip integration tests

* null check for tests

* added query library to codeowners

* null check for tests

* lint

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

@@ -72,4 +72,5 @@ export interface FeatureToggles {
   redshiftAsyncQueryDataSupport?: boolean;
   athenaAsyncQueryDataSupport?: boolean;
   increaseInMemDatabaseQueryCache?: boolean;
+  queryLibrary?: boolean;
 }