MINOR: fix ProduceBenchWorker not to fail on final produce (apache#7254)

When sending bad records, the Trogdor task will fail if the final record produced is bad. Instead we should catch the exception to allow the task to finish since sending bad records is a valid use case.

Reviewers: Tu V. Tran <tuvtran97@gmail.com>, Guozhang Wang <wangguoz@gmail.com>

Author: rayokota

tools/src/main/java/org/apache/kafka/trogdor/workload/ProduceBenchWorker.java

@@ -247,7 +247,11 @@ public Void call() throws Exception {
                     throw e;
                 } finally {
                     if (sendFuture != null) {
-                        sendFuture.get();
+                        try {
+                            sendFuture.get();
+                        } catch (Exception e) {
+                            log.error("Exception on final future", e);
+                        }
                     }
                     producer.close();
                 }