[v2] Report full error for schema violations

[mikeharder]

• Fixes [v2] Report full error for schema violations #4933

Before

ERROR: Schema violation: Data does not match any schemas from 'oneOf'

After

ERROR: Schema violation: Data does not match any schemas from 'oneOf'
{
  code: 'ONE-OF-MISSING',
  message: "Data does not match any schemas from 'oneOf'",
  inner: [
    {
      code: 'OBJECT-MISSING-REQUIRED-PROPERTY',
      message: 'Missing required property: parameters',
      description: 'Describes the format of an example defined using the x-ms-examples extension.'
    },
    {
      code: 'OBJECT-MISSING-REQUIRED-PROPERTY',
      message: 'Missing required property: $ref',
    }
  ]
}