Remove txn add partition info log (apache#13670)

During my test, there are many output logs `handle add partition to txn finish` for the broker.

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pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java

@@ -2348,7 +2348,6 @@ protected void handleAddSubscriptionToTxn(CommandAddSubscriptionToTxn command) {
                         }
                         ctx.writeAndFlush(Commands.newAddSubscriptionToTxnResponse(requestId,
                                 txnID.getLeastSigBits(), txnID.getMostSigBits()));
-                        log.info("handle add partition to txn finish.");
                     } else {
                         ex = handleTxnException(ex, BaseCommand.Type.ADD_SUBSCRIPTION_TO_TXN.name(), requestId);