chaos: grant jdk.internal.misc export so OtelContextStorage uses CARRIER mode

Without --add-exports java.base/jdk.internal.misc=ALL-UNNAMED, OtelContextStorage
silently falls back to ContextStorageMode.THREAD, which vthread-context-cascade
was built to catch: virtual-thread context buffers pinned to a since-freed
carrier's ProfiledThread, corrupting the heap.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: jbachorik

utils/run-chaos-harness.sh

@@ -174,6 +174,7 @@ rm -f "${HS_ERR}"
 timeout "$((RUNTIME + 300))" \
 java -javaagent:${PATCHED_AGENT} \
      --add-opens java.base/java.lang=ALL-UNNAMED \
+     --add-exports java.base/jdk.internal.misc=ALL-UNNAMED \
      ${ENABLEMENT} \
      -Ddd.profiling.upload.period=10 \
      -Ddd.profiling.start-force-first=true \