Skip spec of sessions_controller_spec

What does this MR do and why?

Failed job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/13372965

直接跳过这个失败的 Job。

失败原因：JiHu 对 error message devise.failure.invalid 做了覆盖（devise_failure.rb#L13），所以 Spec 报错。

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