Create a real integration test for the Patient domain

Patient is always a good place to start. Please see the linked Epic for an overview.

Concretely, we need a test class that tests:

1. A GET request to `/openmrs/ws/fhir2/R4/Patient/<uuid>` returns a valid FHIR patient.
2. A POST request to `/openmrs/ws/fhir2/R4/Patient` with a request body consisting of a JSON patient should create a patient.
3. A PUT request to `/openmrs/ws/fhir2/R4/Patient/<uuid>` with a request body consisting of a JSON patient should update the details of the patient record.
4. A DELETE request to `/openmrs/ws/fhir2/R4/Patient/<uuid>` should void the patient.

As models, please see the existing patient integration tests as well as the supporting data files for create and update. Note that these files will likely need to be adjusted to take account of the metadata available from the running OpenMRS server.