Refactor DEBT_ARREARS check to use DataRequest pattern and eliminate KO outcomes

Summary

Mirrors the INSOLVENCY_EARLY_SIGNAL pattern onto DEBT_ARREARS, eliminating KO outcomes and re-routing through DataRequest. This improves the workflow by reusing existing data requests, anchoring lookbacks, and providing enhanced frontend context.

Other Changes

  • Updated data_type enum values in the API extensions:
    • Shifted several enum entries, notably replacing financial_capacity with debt_arrears and cascading changes through subsequent values.
    • Added transport_license as a new enum entry for data_type.

No endpoint paths or HTTP methods changed in this update.