Fix flaky N+1 REST API spec
What does this MR do and why?
This MR reintroduces a warmup call in the REST API spec to prevent flaky behaviour observed in some spec runs (e.g. https://gitlab.com/gitlab-org/security/gitlab/-/jobs/14891128726#L4323)
References
Screenshots or screen recordings
Not provided
How to set up and validate locally
bundle exec rspec spec/requests/api/work_items_spec.rb
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