Spec to ensure `_ids` are cleaned by ImportExport::AttributeCleaner

changelogs/unreleased/security-exclude_ids_attribute_cleaning.yml

+---
+title: Ensure are cleaned by ImportExport::AttributeCleaner
+merge_request:
+author:
+type: security

spec/lib/gitlab/import_export/attribute_cleaner_spec.rb

@@ -26,7 +26,10 @@ describe Gitlab::ImportExport::AttributeCleaner do
       '_html' => '<p>perfectly ordinary html</p>',
       'cached_markdown_version' => 12345,
       'group_id' => 99,
-      'commit_id' => 99
+      'commit_id' => 99,
+      'issue_ids' => [1, 2, 3],
+      'merge_request_ids' => [1, 2, 3],
+      'note_ids' => [1, 2, 3]
     }
   end