Use test name in GitCommandsExecutorTest test data

[MarkEWaite]

Use test name in GitCommandsExecutorTest test data

Assure that any failures clearly identify themselves.

Replace two utility methods with calls to construct good and bad command objects.

Testing done

Confirmed that automated tests pass on Linux with Java 21. Rely on ci.jenkins.io for Windows tests.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue