fix(tests): add qc to ALL_SCHEMA_ROLES in conftest to prevent DuplicateObject on re-runs

[Vishmayraj]

All TestAuth tests were erroring at setup with psycopg2.errors.DuplicateObject: role "qc" already exists.

Tracing the failure back, the qc role was introduced in the auth SQL to support Quality Control workflows (SELECT/UPDATE on Observation, INSERT on Commit), but ALL_SCHEMA_ROLES in conftest was never updated to include it. This meant recreate_database never cleaned up qc between runs, and the second run would crash when istsos_auth.sql tried to CREATE ROLE "qc" again.

Fix is a one-liner: add "qc" to ALL_SCHEMA_ROLES so the cleanup loop in recreate_database drops and re-creates it along with the other roles on every test run.

The commit in context is 03d3235