fix: adding segregation code on NAV extracted from IUV Generator

src/main/java/it/gov/pagopa/wispconverter/util/client/iuvgenerator/IuvGeneratorClientLoggingInterceptor.java

@@ -40,7 +40,7 @@ protected void setInMDCAfterClientResponse(String payload) {
                 if (matcher.find()) {
                     String noticeNumber = matcher.group(1);
                     if (noticeNumber != null && !noticeNumber.isBlank()) {
-                        MDC.put(Constants.MDC_NOTICE_NUMBER, noticeNumber);
+                        MDC.put(Constants.MDC_NOTICE_NUMBER, "3" + noticeNumber);
                     }
                 }
             }