The tests were missing `sidekiq_inline` so basically they data was never
getting into the index and leading to false positives in the N+1 tests
as no results were being found. Also other tests were failing because
the search crieria didn't match or another bug that was found at
https://gitlab.com/gitlab-org/gitlab/issues/103458

We try to avoid this in future by asserting we at least see search
results.