Review and update UI.Tests

[sibille]

The UI.Tests are currently using Uwp templates to test the different scenarios in the Wizard.

There are tests that validate the correct setup for UWP templates, we should add tests for WinUI or WPF here.

The rest of the tests do not depend on a specific platform, we should use a set of test templates here to avoid UI tests breaking due to template changes.

Action Plan:

• [x] Add test to validate correct setup for WinUI and WPF templates
• [x] Change other tests to use a set of test templates
• [ ] Add more asserts
• [ ] Improve test feedback + make the intention of the tests clearer.
• [ ] Extract methods for common setup and asserts