Adds AllowWinZeroHz feature flag on Windows

Allows us to exclude 0Hz support in Windows when investigating
potential regressions.

Bug: 1421656
Change-Id: Ia637643dec201c2af7796a788f4d766aa76c8ba7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4353131


Reviewed-by: Ale Bzk <alessiob@chromium.org>
Commit-Queue: Henrik Andreasson <henrika@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1119479}