Detect OpenAPI breaking changes

[tothandras]

Preflight Checklist

• I have searched the issue tracker for an issue that matches the one I want to file, without success.

Problem Description

Make sure the OpenAPI won't have breaking changes after the 1.0 stable release.

Proposed Solution

Add to CI: https://github.com/Tufin/oasdiff

Alternatives Considered

No response

Additional Information

No response