Fix and Update Mysql Test due to the merge of WR

src/sql/ob_sql_trans_control.cpp

@@ -456,6 +456,9 @@ int ObSqlTransControl::do_end_trans_(ObSQLSessionInfo *session,
         LOG_WARN("fail to inc session ref", K(ret));
       } else {
         callback->handout();
+        // Add ASH flags to async commit of transactions
+        // In the end of async commit in func named ` ObEndTransAsyncCallback::callback() `,
+        // set the ash flag named  `in_committing_` to false.
         ObActiveSessionGuard::get_stat().in_committing_ = true;
         if(OB_FAIL(txs->submit_commit_tx(*tx_ptr, expire_ts, *callback, &trace_info))) {
           LOG_WARN("submit commit tx fail", K(ret), KP(callback), K(expire_ts), KPC(tx_ptr));