Fix Pipeline 2420105

What does this MR do and why?

Fix Pipeline https://jihulab.com/gitlab-cn/gitlab/-/pipelines/2420105

只有一个 Failed Job：https://jihulab.com/gitlab-cn/gitlab/-/jobs/12440468 ，包含两种错误：

1. jh/spec/lib/jh/backup/manager_spec.rb

1) Backup::Manager#create when keep_time is set to remove files removes matching files with a human-readable versioned timestamp with tagged JH
     Failure/Error: connection.public_send(...)
     ActiveSupport::Notifications::InstrumentationSubscriberError:
       Exception(s) occurred within instrumentation subscribers: Gitlab::Database::GitlabSchema::UnknownSchemaError, Gitlab::Database::GitlabSchema::UnknownSchemaError

这个 Spec 是两年前的代码，逻辑太复杂，不过它的目的只是为了测试 JiHu 这边 override 的函数 backup_file? ，所以直接把 Spec 按照 Upstream 的重写了一遍。

2. CrossJoinAcrossUnsupportedTablesError

代码中的 group.owners.first 是在做跨数据库查询，现在不被允许，所以报错。

按照 Upstream 的做法，可以先创建 Issue 来搁置问题。

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