RFR: 8339801: Add better test failure diagnostics to vmTestbase/nsk/jdi/EventRequestManager/threadStartRequests/thrstartreq002

[Chris Plummer]

This test fails periodically. It only prints the exception message when it fails. It should print the entire stack trace so we have a better idea of why it is failing.

Testing: This test is not run until tier5 CI testing, so I'm running all tier5 svc tests.

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Commit messages:
 - Print stack trace of caught exceptions.

Changes: https://git.openjdk.org/jdk/pull/20927/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20927&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339801
  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20927.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20927/head:pull/20927

PR: https://git.openjdk.org/jdk/pull/20927