fix: Don't trigger email and slack notifications when mass importing

feat: Show success message after import

app/stores/DocumentsStore.js

@@ -508,6 +508,8 @@ export default class DocumentsStore extends BaseStore<Document> {
 
     this.addPolicies(res.policies);
     res.data.collections.forEach(this.rootStore.collections.add);
+
+    return res.data;
   };
 
   @action