8382273: Update nsk/jvmti/unit tests to use ThreadWrapper

[shivshah-oracle]

Converted 14 nsk/jvmti/unit tests from extends Thread to extends ThreadWrapper so they can run with both platform and virtual threads

For tests with native methods expecting a Thread (GetStackTrace, GetFrameCount, CheckMonitorInfo, RegisterCompletedThread), changed the native signatures to take Thread and pass .getThread() at the call sites

earlyretbase is left unconverted its native code does GetObjectClass on the thread to find activeMethod(), so it needs the wrapper class for method lookup but the real Thread for JVMTI operations. That one probably needs a separate approach.

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Issue

• JDK-8382273: Update nsk/jvmti/unit tests to use ThreadWrapper (Sub-task - P4)

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