Remove android's custom logdog butler CIPD package from all test tasks

All test tasks already have a butler binary attached as part of the
task template: http://shortn/_wtPKulztVu

So all android test tasks are downloading 2 such binaries. And the one
here is at least 5 years old:
https://chrome-infra-packages.appspot.com/p/infra/tools/luci/logdog/butler/linux-amd64/+/git_revision:ff387eadf445b24c935f1cf7d6ddd279f8a6b04c

So this removes the duplication, which should also help task overhead
a bit.

Bug: None
Change-Id: I948043331b8f0d4fbb705ab64658f5ed2f48972c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3884537
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Haiyang Pan <hypan@google.com>
Reviewed-by: Erik Staab <estaab@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1044762}