Fixes#24996

Summary by cubic

Refactor the API v2 CI breaking-changes check to use tufin/oasdiff via Docker and an ignore list, making the check more reliable and reducing noise from known errors.

• Refactors
  • Replace oasdiff GitHub Action with a Docker command.
  • Add .github/oasdiff-err-ignore.txt to whitelist expected ERRs.
  • Preserve fail-on ERR behavior and existing Swagger generation/tests.

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