[Better Errors] Show error when leaving app password approval flow

[Ecarrion]

Tasks

• [ ] Detect when a user wants to leave the app password login web page before approving app passwords and ask for confirmation about it.

Note: Define strings and share it with the other platform

[dangermattic]

🚫 Please add a type label (e.g. type: enhancement) and a feature label (e.g. feature: stats) to this issue.