[Improve][Manager] Refactor code in manager-service module

[aloyszhang]

Description

In manager-service module, there are many duplicated interfaces for API and open API.
e.g.
https://github.com/apache/inlong/blob/master/inlong-manager/manager-service/src/main/java/org/apache/inlong/manager/service/cluster/InlongClusterService.java#L46~L62

/**
     * Save cluster tag.
     *
     * @param request cluster tag
     * @param operator name of operator
     * @return cluster tag id after saving
     */
    Integer saveTag(ClusterTagRequest request, String operator);

    /**
     * Save cluster tag.
     *
     * @param request cluster tag
     * @param opInfo userinfo of operator
     * @return cluster tag id after saving
     */
    Integer saveTag(ClusterTagRequest request, UserInfo opInfo);

The only difference is the last parameter, one is operator and the other is opInfo.
The opInfo is used to obtain the name operator, so we can say these two interfaces are the same.

There are some problems with this implementation:

• code duplication, there are many redundant codes now
• hard to maintain, we have to change both places when updating, if only change one interface, these two interfaces are out of consistency which we already have now

So, it's better to remove the duplicated code and keep consistency for InLong-API and InLong-OpenAPI.

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