backport #13424 on 22?

> > this as #13424 is merged on main?
>
> Yes @DaanHoogland , the unmount_operation timing out and causing backup to fail is fixed by that PR. The backup will succeed in those cases after throwing a warning.

So we want that one backported to 22 and this one closed, clear.

_Originally posted by @DaanHoogland in https://github.com/apache/cloudstack/issues/12133#issuecomment-5020363567_

首先阅读已合并的 PR #13424 和链接的讨论，以了解对 unmount_operation 超时的修复。检查 CloudStack 22 的 backport 流程，将更改应用到该版本，并验证在受影响的情况下 backup 是否会带有警告成功完成，然后再关闭此 issue。

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