Fix a too strict array-matching expectation

What does this MR do?

This port to CE a fix that was pushed to a CE->EE upstream merge (https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4512#note_58883160).

Are there points in the code the reviewer needs to double check?

This fix is better than the original EE one (https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4512/diffs?commit_id=5c6861423a1243ce9fd5961bea64c0082c7dfd37).

Does this MR meet the acceptance criteria?

• Review
  • Has been reviewed by Backend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together