[PolicyLogs] Adding Flag for chrome://policy/logs on Desktop

Feature: PolicyLogsPageDesktop

Bug: b/282733597
Change-Id: I8aeef1d8e21fd8bcaa9d6cd52dbe3ac4ecf056ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4558987


Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Commit-Queue: Salma Elmahallawy <esalma@google.com>
Cr-Commit-Position: refs/heads/main@{#1148264}