Fix setEventNotificationMode for unmounted virtual threads #15969
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targetThread is NULL only for virtual threads, as per the assertion in
getVMThread, when mustBeAlive is TRUE. vmThreadForTLS is only
used to acquire J9JavaVM in createThreadData and jvmtiTLSGet.
If targetThread is NULL, currentThread is passed to createThreadData
and jvmtiTLSGet for retrieving J9JavaVM in JDK19+.
Related: #15541
Related: #15183
Signed-off-by: Babneet Singh sbabneet@ca.ibm.com