@Override
    protected String getAppConnName() {
        return null;
    }
Override this method and return null by default.
The reason of returning null is that, it is possible that many third-part AppConn may not use SSORequestOperation
which dependents the HttpClient of Linkis
to request the third-part system, so override in this method to avoid to implement it in these subclasses.
<br>
Notice: if you want to use SSORequestOperation, please override this method.
@return null by default.
dss-standard/development-standard/development-process-standard/src/main/java/com/webank/wedatasphere/dss/standard/app/development/operation/AbstractDevelopmentOperation.java