[Java] Destroy native core worker before killing ray processes (#5516)

java/runtime/src/main/java/org/ray/runtime/RayNativeRuntime.java

@@ -131,13 +131,13 @@ public final class RayNativeRuntime extends AbstractRayRuntime {
 
   @Override
   public void shutdown() {
-    if (null != manager) {
-      manager.cleanup();
-    }
     if (nativeCoreWorkerPointer != 0) {
       nativeDestroyCoreWorker(nativeCoreWorkerPointer);
       nativeCoreWorkerPointer = 0;
     }
+    if (null != manager) {
+      manager.cleanup();
+    }
   }
 
   public void run() {