Backfill cron job generates exceptions
Last backfill job finished with:

```
DEBUG: 2024-02-05 02:45:53,249 - root - 99521 analyzed datasets (total: 99521 datasets): 59 datasets have been deleted (0.06%), 864 datasets raised an exception (0.87%)
```

An exception was raised in backfill_dataset() for 864 datasets.

https://kibana.elastic.huggingface.tech/app/discover#/?_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:'2024-02-04T19:45:06.175Z',to:'2024-02-05T03:53:55.398Z'))&_a=(columns:!(message),filters:!(('$state':(store:appState),meta:(alias:!n,disabled:!f,index:de38ff80-ac19-11ec-bb45-ad141ad1c5f8,key:kubernetes.namespace,negate:!f,params:(query:datasets-server),type:phrase),query:(match_phrase:(kubernetes.namespace:datasets-server)))),hideChart:!f,index:de38ff80-ac19-11ec-bb45-ad141ad1c5f8,interval:auto,query:(language:kuery,query:'kubernetes.container.name%20:%20%22prod-datasets-server-backfill%22%20'),sort:!(!('@timestamp',desc)))
Backfill cron job generates exceptions: Last backfill job finished with:

```
DEBUG: 2024-02-05 02:45:53,249 - root - 99521 analyzed datasets (total: 99521 datasets): 59 datasets have been deleted (0.06%), 864 datasets raised an exception (0.87%)
```

An exception was raised in backfill_dataset() for 864 datasets.

https://kibana.elastic.huggingface.tech/app/discover#/?_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:'2024-02-04T19:45:06.175Z',to:'2024-02-05T03:53:55.398Z'))&_a=(columns:!(message),filters:!(('$state':(store:appState),meta:(alias:!n,disabled:!f,index:de38ff80-ac19-11ec-bb45-ad141ad1c5f8,key:kubernetes.namespace,negate:!f,params:(query:datasets-server),type:phrase),query:(match_phrase:(kubernetes.namespace:datasets-server)))),hideChart:!f,index:de38ff80-ac19-11ec-bb45-ad141ad1c5f8,interval:auto,query:(language:kuery,query:'kubernetes.container.name%20:%20%22prod-datasets-server-backfill%22%20'),sort:!(!('@timestamp',desc)))