Add JSON schemas for checkup report outputs + tests

Nikolay Samokhvalovrequested to merge
feat/checkup-report-json-schemas into main

Define strict per-check JSON Schema specs and validate generated payloads in unit tests.

  • Add Draft 2020-12 schemas under reporter/schemas

  • Add report_schemas.validate_report() helper

  • Add tests/reporter/test_report_schemas.py

Edited by Nikolay Samokhvalov

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