[iOS] Suppress banner promo on tabs in new window

When a tab is opened in a new window, many of the callbacks here are
called before the webstate is fully set up and navigated to the final
URL. This should all be ignored, otherwise the promo may be pre-
emptively dismissed or shown.

Bug: 389124673
Change-Id: I06b984068378964b606f678bf8b4b78941c83be2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6214055
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Reviewed-by: Guillaume Jenkins <gujen@google.com>
Cr-Commit-Position: refs/heads/main@{#1413748}