[release-21.0] Address dir traversal in file backup storage `GetBackups` RPC (#18814)#18816

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timvaillancourt merged 3 commits intorelease-21.0from

backport-18814-to-release-21.0

Oct 28, 2025

Commits on Oct 27, 2025

Cherry-pick f0f8f8e0c8ace6945899c4e2ca980f97cec6a65f with conflicts

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Address dir traversal in file backup storage `.ListBackups(...)` (#18814)
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