RFR: 8309397: com/sun/jdi/JdbXXX tests fail due to not being run with -Djdk.trackAllThreads

[Chris Plummer]

The com/sun/jdi/JdbXXX tests rely on the jdb "threads" command output to find the main thread. If it is a virtual thread, it will not be included in the "threads" output unless the debuggee is run with -Djdk.trackAllThreads, so we need to make sure to include this option when launching the debuggee. The following tests are impacted.

com/sun/jdi/JdbMethodExitTest.java
com/sun/jdi/JdbStepTest.java
com/sun/jdi/JdbStopThreadTest.java
com/sun/jdi/JdbStopThreadidTest.java

Note that all these tests also fail due to [JDK-8309334](https://bugs.openjdk.org/browse/JDK-8309334), which needs to be fixed first. Also JdbMethodExitTest.java will fail due to [JDK-8309396](https://bugs.openjdk.org/browse/JDK-8309396), which should be fixed after this CR.

I've tested with mach5 tier5 in a workspace that has integrated the various CRs mentioned. Once JDK-8309334 is fixed, before integrating this PR I'll first merge and verify that the 3 tests being removed from the problem list by this PR also pass.

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Commit messages:
 - Launch debuggee with -Djdk.trackAllThreads

Changes: https://git.openjdk.org/jdk/pull/14293/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14293&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309397
  Stats: 4 lines in 2 files changed: 1 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14293.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14293/head:pull/14293

PR: https://git.openjdk.org/jdk/pull/14293