RFR: 8288989: Make tests not depend on the source code

[Adam Sotona]

On Thu, 2 Nov 2023 09:02:43 GMT, Adam Sotona <asotona at openjdk.org> wrote:

> Two langtool tests depend on the JDK source tree presence. 
> This patch skips the tests execution in a source-less test environment.
> 
> Please review.
> 
> Thanks,
> Adam

retitled as suggested

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PR Comment: https://git.openjdk.org/jdk/pull/16470#issuecomment-1855685435