[Sheriff] Turn off flaky StartupMetricsTest.ReportsValues on win10 x64

Bug: 1459364
Change-Id: I9c710617a4e132f9bdc298a43a224756cd795588
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4657521


Commit-Queue: Frank Liberato <liberato@chromium.org>
Auto-Submit: Frank Liberato <liberato@chromium.org>
Owners-Override: Frank Liberato <liberato@google.com>
Reviewed-by: Matt Reichhoff <mreichhoff@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1164357}