[DRAFT] - fix: add pg8000 graceful shutdown on Cloud Run scale-down

[panish16]

Summary

• Registers a SQLAlchemy connect event listener on app startup that wraps each pg8000 connection's close() to suppress pg8000.exceptions.InterfaceError during Cloud Run scale-down
• Fixes intermittent pg8000.exceptions.InterfaceError: network error logged when Cloud Run terminates idle instances and SQLAlchemy's connection pool teardown tries to close already-severed sockets
• Calls setup_pg8000_close_event_listener(engine) (from sbc-connect-common/cloud-sql-connector) in all affected long-running services
• GCP Cloud Run Jobs (inprogress_update, nr-day-job, bad-name-notifier) were confirmed to have zero InterfaceError occurrences in logs and are excluded

Services fixed

• api/namex/__init__.py
• solr-admin-app/solr_admin/__init__.py
• services/namex-pay/src/namex_pay/__init__.py
• services/solr-names-updater/src/solr_names_updater/__init__.py
• solr-synonyms-api/synonyms/__init__.py

Test plan

• Confirm no new pg8000.exceptions.InterfaceError entries in GCP Log Explorer for a083gt-prod project after deployment
• Existing unit and integration test suites pass

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
20.0% Duplication on New Code

See analysis details on SonarQube Cloud