Draft: 2097 notify open id 3rdway

Description

Try to implement the notification that let user switch to open ID

Screenshots

Technical details

This time, I tried to don't call "AccountManager.addAccount" to add the account. Instead I load the EeloAuthenticatorFragment in the ReLoginWithOidcActivity if the account is removed. So trying to use internal activities & fragment instead of relying on Android's AccountManager API.

Inspired mostly from:

LoginActivity & EeloAuthenticatorFragment.

Tests

Issues

https://gitlab.e.foundation/e/os/backlog/-/issues/2097

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