[native] Rename the QR sign-in navigator

Summary:
This navigator will also handle the restore flow so it has to be renamed.

Depends on D13905

Test Plan: Flow. Tested in combination with the rest of the stack.

Reviewers: kamil, angelika, bartek

Reviewed By: kamil

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D14051