Duplicate Vehicle Models

[TiciaD]

Describe the problem
On the vehicle calculator, the dropdown options for the Vehicle Model include duplicates of vehicles with the same model and year

Actual behavior
The carbon API endpoint returns vehicle models with only data fields for the model name and year so there are no further details to indicate the difference between each

Expected behavior
It's expected that each dropdown option would be unique

To Reproduce
Steps to reproduce the behavior:

1. Go to /travel
2. Click on the Driving tab
3. Click on and select an option from the Vehicle makes dropdown
4. Click on and view the options in the Vehicle models dropdown
5. See error

Screenshots
If applicable, add screenshots or gifs to help explain your problem.

Your Environment:

• Found using Chrome on a Windows 11 Laptop

Additional Information
Can be viewed on the vehicle-frontend branch until merged into development