(fix) Resolve TypeError crash in getWardMetrics when spreading undefined patient arrays

[Abhishek2005-ard]

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Summary

This PR resolves a TypeError crash that occurs in getWardMetrics when attempting to spread iterables (like wardUnadmittedPatientsWithBed.values()) or mapped patient arrays that may evaluate to undefined.

The function was refactored to extract iterables safely using Array.from() with proper optional chaining to prevent undefined property access. Additionally, falsy/undefined values are explicitly filtered out using .filter(Boolean) when constructing the allPatients array, ensuring that downstream demographic metrics do not crash by accessing .person on undefined patient records.

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