The jcmd thread dump related tests should test virtual threads

There are a few jcmd tests that verify stack dumps. They fail with the virtual thread test factory because virtual threads are not included in stack dumps. Need to fix them when jcmd has corresponding options, or avoid running them with virtual threads.

Tests:
sun/tools/jcmd/JcmdOutputEncodingTest.java
serviceability/dcmd/thread/PrintConcurrentLocksTest.java
serviceability/dcmd/thread/PrintTest.java
serviceability/dcmd/thread/ThreadDumpToFileTest.java
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