Ensure federal agencies are linked only to US national location

[maxachis]

Summary

• add new integrity view: integrity__federal_agencies_wrong_location_view
• include the new view in Integrity Monitor CTE checks
• add migration to:
  • create the integrity view
  • remove non-national location links from federal agencies
  • ensure each federal agency has a national location link
• add integration test coverage for the new integrity rule

Validation

• uv run pytest tests/automated/integration/tasks/scheduled/impl/integrity -q
  • result: 5 passed

Closes #535