[fix][broker] Fix HashedWheelTimer leak in PulsarService by stopping it in shutdown (apache#24275)

(cherry picked from commit 1280672)

Author: lhotari

pulsar-broker/src/main/java/org/apache/pulsar/broker/PulsarService.java

@@ -600,6 +600,9 @@ public CompletableFuture<Void> closeAsync() {
             if (transactionExecutorProvider != null) {
                 transactionExecutorProvider.shutdownNow();
             }
+            if (transactionTimer != null) {
+                transactionTimer.stop();
+            }
             MLPendingAckStoreProvider.closeBufferedWriterMetrics();
             MLTransactionMetadataStoreProvider.closeBufferedWriterMetrics();
             if (this.offloaderStats != null) {