[fix]Outdated logs cannot be unlinked if the log path is a symbolic link

[movead123]

What problem does this PR solve?

在Doris313发现，当Doris的日志的路径中包含软链接时，过期日志无法删除。

Release note

None

Check List (For Author)

None

• Behavior changed:

  • Yes. 日志路径存在软链接存在的情况下，过期日志可以删除

• Does this need documentation?

  • No.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[hello-stephen]

Thank you for your contribution to Apache Doris.
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1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
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4. Which code was refactored and why was this part of the code refactored?
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