RFR: 8377313: java/lang/Thread/virtual/stress/GetStackTraceALotWhenPinned.java#id0 timeout

[Alan Bateman]

Dial down the number of iterations in the GetStackTraceALotWhenPinned.java and GetStackTraceALotWhenBlocking.java stress tests.

We have several stress tests that bash on Thread::getStackTrace while virtual threads are in transitions (mount/unmount when parking, blocking, waiting, ..). Some of these tests are running slower since JDK-8376568. Further work is required to reduce/avoid the wait in MountUnmountDisabler::disable_transition_for_one, tracked as JDK-8377312. In the mean-time, we dial down the tests.

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/29598/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29598&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8377313
  Stats: 6 lines in 2 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/29598.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29598/head:pull/29598

PR: https://git.openjdk.org/jdk/pull/29598