fix: validate on_low_score trust-gate policies

[1cbyc]

Closes #345

on_low_score is a typed literal, but values loaded from configuration bypass static checks. A typo could silently skip both failure and skip handling.

This validates the policy before gating and at Airflow, Dagster, and dbt configuration boundaries, with focused regression coverage and an Unreleased changelog entry.

Validation:

• PYTHONPATH=src python -m pytest --no-cov -q tests/test_integrations/test_core.py tests/test_integrations/test_airflow.py tests/test_integrations/test_dagster.py tests/test_integrations/test_dbt.py (34 passed)
• ruff check src/freshdata/integrations tests/test_integrations
• mypy src/freshdata/integrations

[coderabbitai]

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