message: Rperezzamora/small fix for short codes
  * making numberType on ShortCode model object extensible enum
  * Revert "making numberType on ShortCode model object extensible enum"
  This reverts commit
  Reverting change since it should have been done on feature branch
  * adding extensible enum metadata to short code numbertype
diff: "shortCode",
  "alphaId"
  ],
  - "type": "string"
  + "type": "string",
  + "x-ms-enum": {
  + "name": "NumberType",
  + "modelAsString": true
  + }
  },
  "countryCode": {
  "description": "ISO 3166 2-char code representing the country e.g. 'US'.",
  