Add logs for investigating navigation flow problems

[siepra]

Recently Kinga reported the app being stuck on a splash screen while playing around with deep linking.
There's little we can do before we add additional logs in the milestone steps of initial navigation redirection in the react-native layer.

[kingalg]

@siepra those are two issues that we've discussed can be linked to this issue:
#2114
#2108 - this one is not connected to this issue on 99% (but we've discussed it so I'm mentioning it just in case)