8374434: Several JShell tests report JUnit discovery warnings

[lahodaj]

JShell tests where converted to use JUnit instead of TestNG by this commit:
b0ca9bf

As part of the conversion, the @Test annotation had to be copied from classes to test methods, as JUnit requires every test method to be annotated. Sadly the tool doing the conversion moved the annotation to some non-test methods as well. This PR fixes that. The tool has been fixed as well.

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Issue

• JDK-8374434: Several JShell tests report JUnit discovery warnings (Bug - P4)

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• 00: Full (ffd0df4f)