`execution info` in slow query is not accurate

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)
1. create a cluster version v6.5.3
2. prepare one 100 rows sysbench table `sysbench --config-file=config oltp_update_index --tables=1 --table_size=100 --threads=100 prepare`
3. modify the update query to like `UPDATE sbtest1 SET k = k + 1 WHERE id > ? - 10 ;`
4. run the benchmark with table_size = 1 to make the query stable `sysbench --config-file=config oltp_update_index --tables=1 --table_size=1 --threads=100 run`

### 2. What did you expect to see? (Required)
actRows == total_process_keys && total_process_keys == process_keys

### 3. What did you see instead (Required)

All the three values are different. The process_keys may only contain one time execution info.

### 4. What is your TiDB version? (Required)
v6.5.3