[Unit Test] improve eventmesh-common unit test coverage rate

[847850277]

Search before asking

• I had searched in the issues and found no similar issues.

Read the unit testing guidelines

• I have read.

Unit test request

improve eventmesh-common unit test coverage rate

Describe the unit tests you want to do

improve module org.apache.eventmesh.common unit test coverage rate, about list packages

• config
• protocol
• utils

Are you willing to submit PR?

• Yes I am willing to submit a PR!

[github-actions]

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