Get flow fundamental E2E.

Get the regular paths (credential selection, cancellation, navigations
etc.) functional E2E.

Still missing cases like authentication entry, remote entry, etc. Those
will be added later.

Recording: http://shortn/_fEseNusjo2

Bug: 253157237
Test: local deployment
Change-Id: I715c0143c03f7a99a94da784542260590ab4767c