[Bug][Manager] Fix JSON serialization for class BaseSortConf

[gong]

What happened

It will reproduce the problem when request inlong/manager/api/group/get/{groupId}.
It will generate tow same field and one is null. It will lead deserialization exception.

What you expected to happen

no exception.

How to reproduce

You can modify UT to reproduce the problem in inlong-manager/manager-client/src/test/java/org/apache/inlong/manager/client/api/inner/ClientFactoryTest.java

Environment

No response

InLong version

master

InLong Component

InLong Manager

Are you willing to submit PR?

• Yes, I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct