SAP / ui5-fs / 26509562378

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[FIX] Use structuredClone for Resource.statInfo deep copy

The `clone` package recreates internal-slot-backed values like Date and
Temporal.Instant as prototype-only copies, stripping the slot. On Node 26
`fs.Stats` exposes Temporal.Instant getters whose `toJSON` performs a strict
internal-slot check and throws, breaking any consumer that JSON-stringifies
a cloned stat (e.g. `@ui5/builder`'s theme worker IPC).

Replace `clone` with a small helper that preserves the prototype, copies
function-valued own properties by reference, and runs each data value through
`structuredClone` — which correctly handles Date, Temporal, Map, Set, typed
arrays, etc. `sourceMetadata` uses `structuredClone` directly. The unmaintained
`clone` dependency is removed.

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