enchancement: improves UX around validation errors

[ssoroka]

Summary

Validation errors have details buried in them, but it's not exposed via the API. this exposes those validation field-specific errors and greatly improves the readability

Checklist

• Wrote appropriate unit tests
• Considered security implications of the change
• Updated associated docs where necessary
• Updated associated configuration where necessary
• Change is backwards compatible if it needs to be (user can upgrade without manual steps?)
• Nothing sensitive logged
• Commit message conforms to Conventional Commit

Related Issues

Resolves #1143

[BruceMacD]

Are these examples still used with the new OpenAPI generator?

[ssoroka]

yep. I adopted it.