This changes the BuildService trait to return a typed `BuildResult`,
which bundles the refscan info alongside the castore nodes.
The proto type is renamed to BuildResponse, to better map to gRPC
semantics.
In proto land, we don't send the name for outputs anymore, be it the
full path or the last component, as there's never been a guarantee this
is a valid PathComponent. That entry is now required to be anonymous.
The path of an output can be retrieved by looking at the original
BuildRequest.
Change-Id: If5ce3a009cd3dd6bb6505cd51d5f4deda261ea85
Reviewed-on: https://cl.snix.dev/c/snix/+/30387
Autosubmit: Florian Klink <flokli@flokli.de>
Tested-by: besadii
Reviewed-by: Vova Kryachko <v.kryachko@gmail.com>
9caaa09765