- Add GetAsync_Returns404_MapsToNotFound test
- Add GetAsync_Returns400_WithValidationErrors_MapsToValidationError test
- Add GetAsync_Returns401_MapsToUnauthorized test
- Add GetAsync_Returns403_MapsToForbidden test
- Add GetAsync_Returns500_MapsToApiError test
- Add FrameworkReference to Microsoft.AspNetCore.App for ValidationProblemDetails