7903671: jcstress: Update buffer tests for JDK-8318966

[judovana]

part 1: Detecting jdk of target VM and exuding illegible tests

This is prequel to full fixing of CODETOOLS-7903671. This PR detects target JDK version and then disables illegible tests.
part 2 will be done in templates of affected tests and logic around generating the classes from them. In meantime this should server.

The jdk detection will be most likely used anyway. WDYT? If we agree on similar approach, I will create a new bug for this PR only.

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Progress

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Issue

• CODETOOLS-7903671: jcstress: Update buffer tests for JDK-8318966 (Bug - P4)

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• 00: Full (00e60dee)

[judovana]

I made a much more deeper look, and consulted with Aph and Thomas, and it seems that for jdk 23 and up, the correct replacement are direct buffers - which - feel free to correct me - are well covered in jcstress,

Thus the buffer tests should be conditionally excluded, as here, or removed.