[Bug]: Make the BulkRegistration plugin work

### Preflight Checklist

- [x] I have read the [Contributing Guidelines](https://github.com/EnAccess/micropowermanager/blob/main/CONTRIBUTING.md) for this project, if it exists.
- [x] I agree to follow the [Code of Conduct](https://github.com/EnAccess/micropowermanager/blob/main/CODE_OF_CONDUCT.md) that this project adheres to.
- [x] I have searched the [issue tracker](https://github.com/EnAccess/micropowermanager/issues) for a feature request that matches the one I want to file, without success.

### Expected Behavior

Users should be able to upload CSV via the bulk registration plugin.

### Actual Behavior

Users encounter various errors when uploading valid CSV data.

### Steps to reproduce

On the demo environment try to upload the following CSV

```csv
Cluster Name,Mini Grid Name,Village Name,First Name,Surname,Phone number,Alternate phone number,Meter Manufacturer Name,Meter Serial Number,Tariff Name,Tariff Price,Connection Type,_GPS location of household_latitude,_GPS location of household_longitude
Cluster Pemba Island,Wette,Wette Village,Hans,Test,+254123456788,,Demo Meter Manufacturer,1234,A New Tariff, 400, New Connection,11.5,-4

```

### What operating system(s) are you using?

macOS

### Additional Information

_No response_