restrict Revert access to known people

We're seeing revert spam from randos on the internet.
Restrict it to groups of known people who are developing things.

Bug: 40226862
Change-Id: I0fa4e9503037a7cdc8319cca5ebd138970ff9750
Reviewed-on: https://chromium-review.googlesource.com/c/All-Projects/+/5419223
Reviewed-by: Andy Perelson <ajp@chromium.org>