feat: enhance upgrade process with space check and file handling

[HynoR]

What this PR does / why we need it?

#12692

Summary of your change

升级前检查有没有500MB 预留的保守空间
把升级和回退统一成CopyFileWithRename，先临时文件拷贝，然后 mv 改名，避免 cp -f 出错。

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• Made sure tests are passing and test coverage is added if needed.
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• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

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