Changes adapted of 'rspec:coverage' to from Upstream

What does this MR do and why?

Related Upstream MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/123133#note_1429335727

Upstream 修改了 pipeline 配置文件，会导致 Jihu 报错。此 MR 来适配 Upstream，具体包括两部分改动：

1. 删除了之前 rspec:coverage: 中冗余的键值对。它们和 Upstream 一模一样，没必要在 Jihu 再写一遍。比如：extends、stage
2. 基于 Upstream 的 needs 部分，补充 Jihu 自己的 Jobs

最终 Jihu 这边的 rspec:coverage: 很简洁，只有 needs 块：

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