[EOL Incentive] add to about flags

Bug: b/271150076
Change-Id: I8ee3de7025af3336dbc0949928ef3fd305cd4277
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4347586


Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1118880}