Update format of test data dumps and fix tests

test/conftest.py

test/data/presentation_models_data/AlienWave.json

test/data/presentation_models_data/BudgetEntry.json

test/data/presentation_models_data/Capacity.json

test/data/presentation_models_data/CentralProcurement.json

test/data/presentation_models_data/CertificateProviders.json

test/data/presentation_models_data/ChargingStructure.json

...ata/presentation_models_data/CommercialChargingLevel.json

...data/presentation_models_data/CommercialConnectivity.json

test/data/presentation_models_data/ConnectedProportion.json

test/data/presentation_models_data/ConnectionCarrier.json

test/data/presentation_models_data/ConnectivityGrowth.json

test/data/presentation_models_data/ConnectivityLevel.json

test/data/presentation_models_data/ConnectivityLoad.json

test/data/presentation_models_data/CrisisExercises.json

test/data/presentation_models_data/DarkFibreInstalled.json

test/data/presentation_models_data/DarkFibreLease.json

test/data/presentation_models_data/ECProject.json

test/data/presentation_models_data/EOSCListings.json

test/data/presentation_models_data/ExternalConnections.json