message: Changed WebActivity and webhook activity auth to support both AKV and Secrets
diff: },
  "pfx": {
  "description": "Base64-encoded contents of a PFX file.",
  - "$ref": "../datafactory.json#/definitions/SecureString"
  + "$ref": "../datafactory.json#/definitions/SecretBase"
  },
  "username": {
  "description": "Web activity authentication user name for basic authentication.",
  },
  "password": {
  "description": "Password for the PFX file or basic authentication.",
  - "$ref": "../datafactory.json#/definitions/SecureString"
  + "$ref": "../datafactory.json#/definitions/SecretBase"
  },
  "resource": {
  "description": "Resource for which Azure Auth token will be requested when using MSI Authentication.",
  