Refactor finding rpId for login

[lmuntaner]

Motivation

There are scenarios where the RP ID selected is not the correct one for the device the user is in. When that happens, we want to tell the user to try again, but this time, we will select another RP ID.

To be able to select the right RP ID the second time, we need to remember which RP ID was selected in the first place (or second place). We can't store that in the MultiWebAuthnIdentity instance, because there is a new instance every time the user tries to log in.

Instead, I want to store this info in the Connection instance, which is the same across tries.

In this PR, I move the logic of selecting the RP ID to the Connection.fromWebauthnCredentials.

Changes

• Move logic of selecting RP ID to Connection.fromWebauthnCredentials.
• Add rpId parameter to MultiWebAuthnIdentity constructors.

Tests

• Add tests for the login method of Connection class to check that rpID is passed as expected.

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🟡 Some screens were changed

[lmuntaner]

@LXIF @sea-snake please review

[LXIF]

LGTM :)