Skip upsream spec for GitLab::Source

What does this MR do and why?

Describe in detail what your merge request does and why.

• Upstream related MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/118678/diffs
• Failed Pipeline: https://jihulab.com/gitlab-cn/gitlab/-/pipelines/1168582/failures
• Failed Job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/7493728

因为 JH 覆盖了 Upstream 的关于项目信息的方法，导致了 Upstream 的测试报错。 采取的方案是跳过 Upstream 的测试，补充 JH 的测试

Screenshots or screen recordings

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How to set up and validate locally

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MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.