[iOS]Always dismiss interruptible chrome coordinator

Thus I remove UIShutdownNoDismiss and
IsInterruptibleCoordinatorAlwaysDismissedEnabled.

As there are only two possible actions, `SigninCoordinatorInterrupt` is
replaced by BOOL, and `action` by `animated`.

Bug: 381444097
Change-Id: I770315e8d8f956b95d0c37fb4ef31e8d7a8d4fd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6322195
Commit-Queue: Arthur Milchior <arthurmilchior@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Auto-Submit: Arthur Milchior <arthurmilchior@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1428898}