[jdk21u] RFR: 8321067: Unlock experimental options in EATests.java

[Roman Kennke]

The backport for was missing to unlock experimental options, because the LockingMode option only became non-experimental in JDK22. This change adds -XX:+UnlockExperimentalVMOptions to EATests.java run configurations. The fix is JDK21-specific.

Testing:
 - [x] com/sun/jdi/EATests.java

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Commit messages:
 - 8321067: Unlock experimental options in EATests.java

Changes: https://git.openjdk.org/jdk21u/pull/414/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=414&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321067
  Stats: 8 lines in 1 file changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk21u/pull/414.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/414/head:pull/414

PR: https://git.openjdk.org/jdk21u/pull/414