make bench-daily get empty data for BenchmarkXXXPartitionXXX

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

```
make bench-daily TO=/tmp/2024-05-23.json
cat /tmp/2024-05-23.json
```

### 2. What did you expect to see? (Required)

No data missing in the result json file

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

A lot of test cases with BenchmarkXXXPartitionXXX get empty data like `"NsPerOp":0`

```
{"Name":"BenchmarkRangeExprPartitionPreparedPointGet/IndexPointPlanCacheOn","NsPerOp":0,"AllocsPerOp":1795,"BytesPerOp":289237}
```

Open here to see the rendered result http://107.173.155.134:18081/

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

master