[Card Benefits][Curinos] Update benefits feature check

This CL adds another flag check before showing the card benefits toggle
in Chrome settings. Adding this flag check will also ensure that we are
logging that benefits sourced from Curinos are enabled when a new
profile is launched (LogIsCreditCardBenefitsEnabledAtStartup)

go/pay-autofill-chrome-scaling-benefits-design

Bug: 415130486
Change-Id: I7d88c2925d2b75cb1198fbf2a51fe16a310e94cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6507729
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Vinny Persky <vinnypersky@google.com>
Reviewed-by: Siyu An <siyua@chromium.org>
Commit-Queue: Fernando Ramirez <ferny@google.com>
Cr-Commit-Position: refs/heads/main@{#1455107}