Enable NtpChromeCartInHistoryClusterModule in fieldtrial_testing_config.json

Change-Id: Ie88f2e6b4761b7eb0012f9dceae6c9c6fed6c458
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4569463


Commit-Queue: Mei Liang <meiliang@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1149450}