Validate Web pipeline test against GitLab v12.x
While working on !327 (merged), it was found that one of the 4 requests in
web_project_pipelines_pipeline tests fails with redirect on GitLab v12.5. Specifically, it's failing on
/tests/summary.json. It could be that this endpoint didn't exist at that time.
The issue is to resolve this issue or set a limit for the minimum GitLab version when the test could be run.