remove reference destroy guardian (#5863)

fix #5855

dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ReferenceConfig.java

@@ -465,26 +465,6 @@ public class ReferenceConfig<T> extends ReferenceConfigBase<T> {
         this.bootstrap = bootstrap;
     }
 
-    @SuppressWarnings("unused")
-    private final Object finalizerGuardian = new Object() {
-        @Override
-        protected void finalize() throws Throwable {
-            super.finalize();
-
-            if (!ReferenceConfig.this.destroyed) {
-                logger.warn("ReferenceConfig(" + url + ") is not DESTROYED when FINALIZE");
-
-                /* don't destroy for now
-                try {
-                    ReferenceConfig.this.destroy();
-                } catch (Throwable t) {
-                        logger.warn("Unexpected err when destroy invoker of ReferenceConfig(" + url + ") in finalize method!", t);
-                }
-                */
-            }
-        }
-    };
-
     private void postProcessConfig() {
         List<ConfigPostProcessor> configPostProcessors =ExtensionLoader.getExtensionLoader(ConfigPostProcessor.class)
                 .getActivateExtension(URL.valueOf("configPostProcessor://"), (String[]) null);