Add ui_unit_tests as requirement for publish_to_pypi

ui_unit_tests was gated behind ui_build but not required for publishing.
This ensures UI unit tests must pass before PyPI publish.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.circleci/config.yml

@@ -4828,6 +4828,7 @@ workflows:
             - langfuse_logging_unit_tests
             - litellm_assistants_api_testing
             - auth_ui_unit_tests
+            - ui_unit_tests
             - db_migration_disable_update_check
             - e2e_ui_testing_chromium
             - e2e_ui_testing_firefox