Potential issues with backup path containing glob or whitespace characters

[pcahyna]

Follow-up to https://github.com/rear/rear/pull/3242.

PR https://github.com/rear/rear/pull/3242 fixes some instances of unquoted $mountpoint expansion, but some remain:

https://github.com/rear/rear/pull/3242#discussion_r1636209286 https://github.com/rear/rear/pull/3242#discussion_r1636210756 https://github.com/rear/rear/pull/3242#discussion_r1636223326 https://github.com/rear/rear/pull/3242#discussion_r1636227269 https://github.com/rear/rear/pull/3242#discussion_r1636227586 https://github.com/rear/rear/pull/3242#discussion_r1636227732 https://github.com/rear/rear/pull/3242#discussion_r1636228126

I suppose that this might be a problem either if the URL contains a path with glob or whitespace characters, or if the temporary mountpoint path name contains such characters (which could happen when TMPDIR contains them), depending on usage.

[jsmeix]

ReaR v3.1 milestone according to https://github.com/rear/rear/pull/3242#issuecomment-2177724492

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