[Better Errors] Add Site Credential Tracking

[Ecarrion]

Name	Properties	When
*_site_credentials_invalid_login_page_detected		When the app detects that there is an invalid login page and can't log in natively
*_site_credentials_app_password_explanation_dismissed		When the user chooses to tap back on the app passwords explanation screen
*_site_credentials_app_password_explanation_contact_support_tapped		When the user chooses to contact support on the app passwords explanation screen
*_site_credentials_app_password_explanation_continue_button_tapped		When the user chooses to continue to log in with app passwords on the app password explanation screen.
*_site_credentials_app_password_loggin_success		When the user successfully approves the app password during login
*_site_credentials_app_password_loggin_failed	error	When we detect that there was an error approving or loading the app password
*_site_credentials_app_password_login_exit_confirmation		When the user tries to exit the app password login page without approving the app password first
*_site_credentials_app_password_login_dismissed		When the user exists the app passwords login page after confirmation

[dangermattic]

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