Refactor Park MVVM to use current park instead of park location for naming

[SaturneV]

Description

Our current implementation of Park MVVM, and more specifically of the logic behind park naming, uses a specific _parkLocation variable that allows us to call an API to obtain the correct park name. However, this park location is already stored in the ViewModel via the _currentPark variable, so it would be simpler to use it directly for this task.

This refactor would allow us to lighten the ViewModel by removing duplicate variables and functions that have the same purpose.

Tasks

• Remove the _parkLocation variable from the Park ViewModel.
• Adapt or remove the related Park ViewModel functions.
• Adapt all the projects files that use the _parkLocation variable
• Adapt all the projects tests files that use the _parkLocation variable