Update etasu for medication reference

[avirgulto]

Describe your changes

When a medication request contains medicationreference instead of medication codableconcept it doesn't work. We need to handle when the MedicationRequest contains a medicationReference instead of a medicationCodeableConcept.

Test case: The Turalio MedicationRequest (pat036-mr-turalio) for Alice Smith (pat036) contains a medicationReference instead of a medicationCodeableConcept.
To Test:
Go through steps as normal for alice smiths's turalio medicaiton. Should see etasu status as expected.

Issue ticket number and Jira link

https://jira.mitre.org/browse/REMS-668

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[plarocque4]

The change look great and work well from the request generator. I tested the same medication/patient from the pharmacy and the SMART on FHIR app and found that the ETASU check wasn't updating properly. This is likely a similar problem. We need to decide if we should fix it here or with another ticket.

[plarocque4]

This works well for queries from the request generator.