Fix null user profile bug

This will close #258, the bug the coaches pointed out during the last scrum retrospective.

To solve it, I moved the logic from the NavigationActions to the AppNavHost. This allows us to do the checks at application start. I added a loading animation to avoid blocking the app during the checks. This will close #105.

Note that as the authentication relied on the NavigationActions for navigating to the correct route (profile creation or map), there were some tests which broke. So I had to put some more logic into the authentication view models.

echo-swent / echo

Fix null user profile bug #269

Quality Gate passed