[NDH-830] Update PractitionerRole Endpoint

[spopelka-dsac]

module-name: [NDH-830] Update PractitionerRole Endpoint

Jira Ticket #NDH-830

Problem

As I was going through and working on performance improvements, I realized that we were not exposing endpoints at /fhir/PractitionerRole, which we needed to do. I also realized we still had a few tests that were not fully making the necessary assertions.

Solution

• Add endpoint serialization to the PractitionerRoleSerializer
• Improve practitioner role fixtures (and other test fixtures) to better generate the expected test data
• Fix tests that were giving false negatives due to insufficient assertions and/or insufficient test data
• Rename a couple of PractitionerRole filters to better align with the FHIR spec

Result

We now have endpoints at PractitionerRole! And we have more robust tests!

Test Plan

• All tests should pass
• run docker compose up --build and navigate to localhost:8000/fhir/PractitionerRole?endpoint_status=active to confirm that the "endpoint" attribute looks as expected. (note: not all practitioner role resources have endpoints associated with them, so the query param forces records that have endpoints to be shown)

NOTE: This PR should be merged after #385

[spopelka-dsac]

NOTE: This PR should be merged after #385