Investigate missing statusCode in logs and improve error handling with failures like "Unexpected end of JSON input", and other non backend errors:

```
{"t":

,"s":"I","c":"ATLAS-AI-SERVICE","id":1001000297,"ctx":"AtlasService","msg":"Making a fetch","attr":{"url":"https://cloud.mongodb.com/api/private/ai/api/v1/mql-query"}}
{"t":

,"s":"W","c":"COMPASS-QUERY-BAR-UI","id":1001000198,"ctx":"AIQuery","msg":"AI query request failed","attr":{"statusCode":null,"errorMessage":"Unexpected end of JSON input","errorName":"request_error","errorCode":"SyntaxError"}}
```