Fix flaky create work item spec

What does this MR do and why?

We already tried to fix this flaky spec in !165082 (merged), but today I got in in one of my MRs consistently https://gitlab.com/gitlab-org/gitlab/-/jobs/8387064365

I also see we have new occurrences in #502389 (closed)

I have confirmed we actually use an order in the DB when paginating linked items, with a query like the following

SELECT 
  issues.*, 
  issue_links.id AS issue_link_id, 
  issue_links.link_type as issue_link_type_value, 
  issue_links.target_id as issue_link_source_id, 
  issue_links.created_at as issue_link_created_at, 
  issue_links.updated_at as issue_link_updated_at 
FROM 
  "issues" 
  INNER JOIN issue_links ON (
    issue_links.source_id = issues.id 
    AND issue_links.target_id = 439
  ) 
  OR (
    issue_links.target_id = issues.id 
    AND issue_links.source_id = 439
  ) 
ORDER BY 
  "issue_links"."id" DESC 
LIMIT 
  101

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Related to #502389 (closed)