Resolved mismatch stubbings in AddFixVersionTest.java

[ARMS2025]

I analyzed the test doubles (mocks) in the test code of the project. In my analysis of the project, I observed that

In the test testResiliency:

• the addFixVersion method for the jiraClientSvc object:
  i) during test execution the method is actually called with arguments ["SSD-102", "Beta Release"], but is not stubbed, resulting in a mismatch stubbing.

In general, a mismatched stubbing occurs when a method is stubbed with specific arguments in a test but later invoked with different arguments in the code. Mockito recommends addressing this type of issue (https://www.javadoc.io/doc/org.mockito/mockito-core/latest/org.mockito/org/mockito/exceptions/misusing/PotentialStubbingProblem.html).

I propose a solution below to resolve the mismatch stubbing. Happy to modify the pull request based on your feedback.

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