Change the model validation errors output

[Tolkie]

Current output looks like
{ "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1", "title": "One or more validation errors occurred.", "status": 400, "traceId": "00-b639e7886ee9044090af6bd072b5237d-11188e924e2fd748-00", "errors": { "LastName": [ "The LastName field is required." ] } }
We should remove the type and traceId fields.

[Tolkie]

https://stackoverflow.com/questions/51125569/net-core-2-1-override-automatic-model-validation
https://www.jerriepelser.com/blog/validation-response-aspnet-core-webapi/