RFR: 7903695: jcstress: Handle nested UOEs as API mismatch soft errors

[Aleksey Shipilev]

Manifests in buffer tests after [JDK-8325984](https://bugs.openjdk.org/browse/JDK-8325984). The tests themselves would likely need updates, see [CODETOOLS-7903671](https://bugs.openjdk.org/browse/CODETOOLS-7903671), but the harness should not really fail hard on UOE that signal API mismatch.

-------------

Commit messages:
 - Fix

Changes: https://git.openjdk.org/jcstress/pull/147/files
  Webrev: https://webrevs.openjdk.org/?repo=jcstress&pr=147&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903695
  Stats: 26 lines in 1 file changed: 18 ins; 7 del; 1 mod
  Patch: https://git.openjdk.org/jcstress/pull/147.diff
  Fetch: git fetch https://git.openjdk.org/jcstress.git pull/147/head:pull/147

PR: https://git.openjdk.org/jcstress/pull/147