fix: using response content for notice number extraction

src/main/java/it/gov/pagopa/wispconverter/util/client/AbstractAppClientLoggingInterceptor.java

@@ -379,7 +379,7 @@ private void generateRe(
                             .build();
         }
         if (this.mustPersistEventOnRE) {
-            setInMDCAfterClientResponse(new String(body));
+            setInMDCAfterClientResponse(responseContext != null ? responseContext.getPayload() : "");
             reService.sendEvent(status, null, outcome, requestContext, responseContext);
             deleteFromMDCAfterClientResponse();
         }