Fix pipeline 2499150

What does this MR do and why?

Fix Pipeline https://jihulab.com/gitlab-cn/gitlab/-/pipelines/2499150/failures

1. 关于 Pathname 的报错

Failure/Error: definition.target.dump(destination_dir, backup_id)
       #<InstanceDouble(Backup::Targets::Files) (anonymous)> received :dump with unexpected arguments
         expected: ("/builds/gitlab-cn/gitlab/tmp/tests/backups/lfs.tar.gz", "custom")
              got: (#<Pathname:/builds/gitlab-cn/gitlab/tmp/tests/backups/lfs.tar.gz>, "custom")

Job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/12836589

Upstream 改变了参数的格式，把字符串改成 Pathname 对象。

2. "google_cloud_support" 相关的测试

Job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/12836563

这是 Upstream-only 的 feature，所以直接跳过。

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