Remove flow from questions (#19220)

frontend/src/metabase/questions/types.js

-/* flow */
-
-import type { Collection } from "metabase-types/types/Collection";
-import type { Label } from "metabase-types/types/Label.js";
-
-export type Entity = {
-  id: number,
-};
-
-export type Item = {
-  entity: Entity,
-  id: number,
-  name: string,
-  description: string,
-  created: ?string,
-  by: ?string,
-  icon: ?string,
-  favorite: boolean,
-  archived: boolean,
-  selected: boolean,
-  visible: boolean,
-  collection: Collection,
-  labels: Label[],
-};