message: adding regex to check cosmos db account name
diff: "x-ms-parameter-location": "method",
  "description": "Cosmos DB database account name.",
  "minLength": 3,
  - "maxLength": 50
  + "maxLength": 50,
  + "pattern": "^[a-z0-9]+(-[a-z0-9]+)*"
  },
  "filterParameter": {
  "name": "$filter",
  