Update StubInvocationUtilTest.java

[gzhao9]

Purpose of the Change

This PR is aimed at resolving the issue of duplicated creation of mock. This occurs in five test cases in StubInvocationUtilTest.java, as highlighted in issue #13153.

Brief changelog

We created 5 reusable methods to create the mock, avoiding duplicate creation of the mock in 5 test cases.
We also set the five mock objects as class attributes and create them in @BeforeEach.
After removing duplicate mocks for 5 test cases, our refactoring reduced the number of lines of code by 76 lines, improving readability and maintainability.

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
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• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
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[AlbumenJ]

LGTM

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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