Add the confirm button on the get flow and remove the Sign in another way...

Add the confirm button on the get flow and remove the Sign in another way button if there’s no other entries to show in the next page

Screenshots:
1. When there's only one acount and no other entries: https://screenshot.googleplex.com/8u2u3WNbLe8AiS7
2. When there's only one account but other entries: https://screenshot.googleplex.com/937Ba2QdtFMrn9P
3. When there's multiple accounts: https://screenshot.googleplex.com/4uxuRuSTLP95Jui

Test: deployed locally

Bug: 264959820
Fix: 264959820

Change-Id: I6f6ef879a0ff4bd4f17da35f0300df75c09190b1