Skip spec of VulnerabilityExports headers

What does this MR do and why?

Fix pipeline

Upstream MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/152517

Upstream 新增了一个测试，用来验证导出 CSV headers 字段的 Spec。但 JiHu 有不同的 headers，所以直接跳过它。

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