test delete/expunge functionality

[mattStorer]

HAPI FHIR provides a mechanism to delete resources and expunge them. test this out in the SDS to make sure that it's a viable strategy.

From Google Groups thread https://groups.google.com/g/hapi-fhir/c/0TQmQIEuewk:

The $expunge Operation is in the HAPI-FHIR code here:
https://github.com/hapifhir/hapi-fhir/blob/master/hapi-fhir-storage/src/main/java/ca/uhn/fhir/jpa/provider/BaseJpaResourceProvider.java#L225

In order to be able to use it, you must uncomment one of the following lines in your application.yaml file:
https://github.com/hapifhir/hapi-fhir-jpaserver-starter/blob/master/src/main/resources/application.yaml#L112
https://github.com/hapifhir/hapi-fhir-jpaserver-starter/blob/master/src/main/resources/application.yaml#L127

Kevin

see https://smilecdr.com/docs/fhir_repository/deleting_data.html#expunge