code: public String getAuthType() {
          final AuthenticationSetting authSetting = getAuthenticationSetting();
          if (authSetting == null) {
              return "AzureCLI";
          }
          if (StringUtils.isNotEmpty(authSetting.getServerId())) {
              return "ServerId";
          }
          if (authSetting.getFile() != null) {
              return "AuthFile";
          }
          return "Unknown";
      }
docs: Add AuthType ENUM and move to AzureAuthHelper.