test: Add explit API for archiving test artifacts

BUG=chromium:1063474
TEST=./generate.sh

Change-Id: I84ad4a18640f7553e8341b97c8099389847fb0d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2111330
Commit-Queue: Prathmesh Prabhu <pprabhu@chromium.org>
Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>
Reviewed-by: Alex Zamorzaev <zamorzaev@chromium.org>
4 files changed