Show error message for API 500 error in tests
What does this MR do?
Show error message for API 500 error in tests, and document have_gitlab_http_status
Are there points in the code the reviewer needs to double check?
Do we need a changelog entry? No user difference expected but developer difference
Why was this MR needed?
Easier to debug tests
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug - Review
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Has been reviewed by Backend
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What are the relevant issue numbers?
Closes #36174 (closed)