[improve][offload] Use filesystemURI as the storage path

[nikhil-ctds]

(cherry picked from commit b915f6e) (cherry picked from commit c1cc2d6)

Motivation

This PR sync a commit from apache/branch-3.0 into 3.1_ds which are not present.

Modifications

• Cherry-picked a commit from branch-3.0 which are not present on 3.1_ds.

Verifying this change

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This change is a trivial rework / code cleanup without any test coverage.

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• Dependencies (does it add or upgrade a dependency): (no)
• The public API: (no)
• The schema: (no)
• The default values of configurations: (no)
• The wire protocol: (no)
• The rest endpoints: (no)
• The admin cli options: (no)
• Anything that affects deployment: (no)

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