[3.1] ReflectionBasedServiceDiscovery#doUnregister recursion call

[haoyann]

ReflectionBasedServiceDiscovery#doUnregister recursion call and no break, looks like a bug.

dubbo/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/ReflectionBasedServiceDiscovery.java

Lines 187 to 193 in c80b791

	public void doUnregister(ServiceInstance serviceInstance) throws RuntimeException {
	doUnregister(serviceInstance);
	// notify empty message to consumer
	metadataService.exportInstanceMetadata("");
	metadataService.getInstanceMetadataChangedListenerMap().forEach((consumerId, listener) -> listener.onEvent(""));
	metadataService.getInstanceMetadataChangedListenerMap().clear();
	}

[liufeiyu1002]

ok 我来修复它

[liufeiyu1002]

PR #10464