Ensure there are no duplicates in the returned patient results from open client registry

[mherman22]

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Summary

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Related Issue

Fixes #1308

Other

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[mherman22]

https://github.com/mherman22/OpenELIS-OpenCR-HIE-Setup for spining up openelis + openhim + opencr.

[mherman22]

this requires your review aswell @mozzy11