Fix rubocop warnings

What does this MR do and why?

Fix failed job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/5926820

这些 Rubocop 格式检查时暴露的问题，大半都由 Rubocop 工具自动修复，小半由我手动修复。

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cc @prajnamas @zhzhang