fix:fix PolarisContextProperties instantiated twice causing NPE.

spring-cloud-tencent-rpc-enhancement/src/main/java/com/tencent/cloud/rpc/enhancement/instrument/webclient/EnhancedWebClientExchangeFilterFunction.java

@@ -107,8 +107,7 @@ public class EnhancedWebClientExchangeFilterFunction implements ExchangeFilterFu
 				.doOnError(t -> {
 					enhancedPluginContext.setDelay(System.currentTimeMillis() - startTime);
 					enhancedPluginContext.setThrowable(t);
-					enhancedPluginContext.setTargetServiceInstance((ServiceInstance) MetadataContextHolder.get()
-							.getLoadbalancerMetadata().get(LOAD_BALANCER_SERVICE_INSTANCE), originRequest.url());
+
 					// Run exception enhanced plugins.
 					pluginRunner.run(EnhancedPluginType.Client.EXCEPTION, enhancedPluginContext);
 				})