bot_scaling.proto: Move enums into message bodies.

Move Enums inside of the proto messages to make them more accessble.

Remove Actionable from RobocropAction as actionable is tied to each
scaling action and will be inspected, therefore this is a bit redundant
since we also need to account for Mode.

Bug: chromium:1027593
Change-Id: I7a54acdab2355a44b0d7e6cb41413625e5f5b85f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2111112
Reviewed-by: David Burger <dburger@chromium.org>
Commit-Queue: Mike Nichols <mikenichols@chromium.org>
Tested-by: Mike Nichols <mikenichols@chromium.org>
2 files changed