Fix size of splits
fixes #2581 

---

After merging and deploying, I'll refresh all the affected datasets.

It's not so much (<2k jobs)

```
db.cachedResponsesBlue.countDocuments({
    "kind": "config-parquet-and-info"
})
140609
db.cachedResponsesBlue.countDocuments({
    "kind": "config-parquet-and-info",
    "updated_at": { 
        $gte: new Date("2024-03-12T08:00:00.000Z"),
    }
})
1644
```
Fix size of splits: fixes #2581 

---

After merging and deploying, I'll refresh all the affected datasets.

It's not so much (<2k jobs)

```
db.cachedResponsesBlue.countDocuments({
    "kind": "config-parquet-and-info"
})
140609
db.cachedResponsesBlue.countDocuments({
    "kind": "config-parquet-and-info",
    "updated_at": { 
        $gte: new Date("2024-03-12T08:00:00.000Z"),
    }
})
1644
```