Solar consumer does not run when running at NL

[peterdudfield]

Describe the bug

When running the app for the NL, it currently doesn't run when attached to a data-platform with a uk-national
I suspect this is similar when running this for BE

Expected behavior

Run it locally with data-platform with UK locations in it, and it works and saves generation values to the data-platform

Additional context

To make NL work, we need to

• country to be added to metadata of the location
• _list_locations should also take country in and see if they are in the database already
• NL should have both dp.LocationType.NATION and dp.LocationType.COUNTY, this could be stored in the locations.csv
• add a test where we add a location that is in the UK, but check NL and BE still work