Add sign-in panel in glic window

If the account is in a persistent error state, show
an error panel that tells the user to sign-in. Clicking
the button will close the glic window and open a
sign-in page.
This change also keeps the glic window open whenever the
profile is no longer 'ready', preferring to instead show
either the sign-in error panel or the unavailable panel.

Bypass-Glic-Api-Compatibility-Check: enum change is safe
Bug: 396500584
Change-Id: I61181eb635d5edaee97d60c0521857cc29eeb148
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6388984
Commit-Queue: Dan Harrington <harringtond@chromium.org>
Reviewed-by: Ian Wells <iwells@chromium.org>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1440521}