bucket_id and collection_id are not validated on the records collection url.

```self.app.get("/buckets/beer/collections/barley'/records", headers=self.headers, status=404)```

While it should probably be
```self.app.get("/buckets/beer/collections/barley'/records", headers=self.headers, status=400)```

Start by reproducing the records collection request shown in the issue and trace the handler for the bucket and collection URL. The work is done when malformed bucket_id or collection_id values on this endpoint return HTTP 400 instead of 404, with the relevant tests passing.

Written by the indexing model from the issue text.