bot_scaling: Add swarming field and remove Resourceusage type

Add a field to track the swarming URL for each config message, as well
as removing ResourceUsage as it has been decommissioned in favor of
ResourceUtilization.

Bug: chromium:1093415
Change-Id: If1578ed252a59f958829ea570f2583bef238687b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2239758
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: David Burger <dburger@chromium.org>
Commit-Queue: Mike Nichols <mikenichols@chromium.org>
Tested-by: Mike Nichols <mikenichols@chromium.org>
2 files changed