remove obsolete error code
Follows #2227

To be merged next week, when all the occurrences will have been recomputed.

Currently:

```
use datasets_server_cache
db.cachedResponsesBlue.countDocuments({kind: "split-descriptive-statistics", error_code: "SplitWithTooBigParquetError"})
2937
```

remove obsolete error code: Follows #2227

To be merged next week, when all the occurrences will have been recomputed.

Currently:

```
use datasets_server_cache
db.cachedResponsesBlue.countDocuments({kind: "split-descriptive-statistics", error_code: "SplitWithTooBigParquetError"})
2937
```
