[jdk21u-dev] RFR: 8339591: Mark jdk/jshell/ExceptionMessageTest.java intermittent

[Matthias Baesken]

8339591: Mark jdk/jshell/ExceptionMessageTest.java intermittent

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Commit messages:
 - Backport cb5c60b530dd744e7d78ef69f15eef7521c4f1cc

Changes: https://git.openjdk.org/jdk21u-dev/pull/987/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=987&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339591
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/987.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/987/head:pull/987

PR: https://git.openjdk.org/jdk21u-dev/pull/987