bot_scaling: reduce redundancy for bot policy modes

Remove redundant enums for a cleaner proto.

BUG=b/177572611
TEST=generate

Change-Id: I4cbfe08fed39e55b45b97113ab9b4d320ac359b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2638360
Reviewed-by: Mike Nichols <mikenichols@chromium.org>
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
Commit-Queue: Julio Hurtado <juahurta@google.com>
2 files changed