Enable fieldtrial testing config for HttpsUpgrades

The bulk of the tests failing due to Https Upgrades feature have been
handled in crbug.com/1424194.

This CL fixes the remaining tests by allowlisting affected hostnames
and enables the feature in test configs.

Bug: 1394910
Change-Id: Iac5de38af86eb3f9b0f3ac5ca89386938b63200a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4312951


Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Devlin Cronin <rdevlin.cronin@chromium.org>
Reviewed-by: Carlos IL <carlosil@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1118919}