[Improvement] Unit tests support mocking the ShuffleServerNettyHandler class

[rickyma]

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• [X] I have searched in the issues and found no similar issues.

What would you like to be improved?

Unit tests support mocking the ShuffleServerNettyHandler class in order to better cover the business code for the netty part.

We can search for TODO skip validating for GRPC_NETTY, needs to mock ShuffleServerNettyHandler in our codes.

How should we improve?

No response

Are you willing to submit PR?

• [ ] Yes I am willing to submit a PR!

[rickyma]

This is really important in Netty mode. Anyone is welcome to pick this up.

[rickyma]

This is really important in Netty mode. Anyone is welcome to pick this up.

When running in prod, we currently use Netty mode due to https://github.com/apache/incubator-uniffle/issues/1651, so this issue is very important. Because we lack the ability to test Netty business codes using UTs. If you are interested, I can assign this issue to you. That will be of great help.

@maobaolong

[maobaolong]

@rickyma Will take a look at this issue, thank you!