[BLUEJ-1351] JUnit 5 test results window should support @DisplayName tags

With JUnit 5 we can use the @DisplayName annotation above our tests to make the nature of the test more clear and readable than the method name often is by itself.

In classrooms where teachers write tests for student assignments, it would be especially valuable to have full sentences explain the problem with the code and for the students to see this in the test window.

Perhaps the @DisplayName annotation could also be incorporated into the default template when new test methods are created.

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• Issue type: Task
• Priority: Low