JBoss EAP 8.0 startup fails with `InaccessibleObjectException` and `NoClassDefFoundError` on JDK 21 when `PRESERVE_JAVA_OPTS=true` is set

Issue

• When starting JBoss EAP 8.0 on JDK 21 with the environment variable PRESERVE_JAVA_OPTS=true set, the process fails and the server.log file shows multiple errors.
• The errors include java.lang.reflect.InaccessibleObjectException and java.lang.NoClassDefFoundError: Could not initialize class org.wildfly.clustering.marshalling.protostream.util.UtilMarshallerProvider.
• A specific error message is: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.lang.Class java.util.EnumMap.keyType accessible: module java.base does not "opens java.util" to unnamed module.
• Adding the JVM option --add-opens java.base/java.util=ALL-UNNAMED to JAVA_OPTS allows the server to start.