[iOS] Fix discrepancy between enabled states for passkeys

By default, in debug, passkeys were enabled in the CPE and
disabled in Chrome, so this CL fixes the discrepancy.

Also, tests which would fail when enabling the passkey
feature have been adjusted to pass regardless of the
state of this feature.

Bug: 355048777
Change-Id: I69f18adcf37e10204a3cf0635283cd901ec08533
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5972593
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Alexis Hétu <sugoi@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1375319}