8350903: Remove explicit libjvm.so dependency for libVThreadEventTest

[jianglizhou]

Please review the test fix that removes libVThreadEventTest explicit dependency to libjvm, by removing the call to JNI_GetCreatedJavaVMs in Agent_OnAttach. There is a vm argument passed via Agent_OnAttach. With the change, libVThreadEventTest no longer needs to be linked with libjvm.so (or jvm.dll). VThreadEventTest.java now runs on both dynamic and static JDK.

Tested on static JDK locally
GHA: https://github.com/jianglizhou/jdk/actions/runs/13577993687/job/37960245161

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Progress

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Issue

• JDK-8350903: Remove explicit libjvm.so dependency for libVThreadEventTest (Bug - P4)

Reviewers without OpenJDK IDs

• @mScott224 (no known openjdk.org user name / role)

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