oasOpErrorResponse
oasOpErrorResponse will scan an OpenAPI specification looking at each operation,
and ensuring at least one 4xx HTTP Error responses has been defined.
The function is used by the operation-4xx-response Rule
oasOpErrorResponse will scan an OpenAPI specification looking at each operation,
and ensuring at least one 4xx HTTP Error responses has been defined.
The function is used by the operation-4xx-response Rule