project_mgmt: Add gs_bucket for Project and Program.

- Will initially be used for logging stdout logs from project
and program builds. In the future, could be used for other
artifacts.

BUG=chromium:1067000
TEST=./generate.sh

Change-Id: Ib61294fe076051c1bd59d13fcd9748c40b57362b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2137466
Commit-Queue: Andrew Lamb <andrewlamb@chromium.org>
Tested-by: Andrew Lamb <andrewlamb@chromium.org>
Reviewed-by: David Burger <dburger@chromium.org>
4 files changed