[java] Create new Fortune object in scope of request (#10655)

The new fortune object must be constructed in the scope of the request,
not as a constant:

> Within the scope of the request, a new Fortune object must be
constructed and added to the list.

https://github.com/TechEmpower/FrameworkBenchmarks/wiki/Project-Information-Framework-Tests-Overview#fortunes

Author: p8

frameworks/Java/helidon/reactive/src/main/java/io/helidon/benchmark/reactive/services/FortuneService.java

@@ -16,8 +16,6 @@
 
 public class FortuneService implements Service, Handler {
 
-    private static final Fortune ADDITIONAL_FORTUNE = new Fortune(0, "Additional fortune added at request time.");
-
     private final DbRepository repository;
 
     public FortuneService(DbRepository repository) {
@@ -34,7 +32,7 @@ public void accept(ServerRequest req, ServerResponse res) {
         res.headers().contentType(MediaType.TEXT_HTML.withCharset(StandardCharsets.UTF_8.name()));
         repository.getFortunes()
                 .forSingle(fortuneList -> {
-                    fortuneList.add(ADDITIONAL_FORTUNE);
+                    fortuneList.add(new Fortune(0, "Additional fortune added at request time."));
                     fortuneList.sort(Comparator.comparing(Fortune::getMessage));
                     res.headers().contentType(MediaType.TEXT_HTML.withCharset(StandardCharsets.UTF_8.name()));
                     res.send(fortunes.template(fortuneList)