build(proto): stop generating golang code

We originally added the golang codegen to provide first-class support to
downstream integrators. This is no longer necessary, as those same
integrators, e.g. Strangelove, are performing their own codegen in the
respective repos. These codepaths in the Penumbra monorepo are unused
and largely unmaintained, so I'm culling them.

Refs #2184. Moots and therefore closes #2731.

deployments/scripts/protobuf-codegen

@@ -8,7 +8,7 @@ repo_root="$(git rev-parse --show-toplevel)"
 # Purge the output dirs, to ensure that the codegen is complete:
 # if upstream removed files, we want them removed from all outputs, too.
 echo "Cleaning output dirs..."
-for d in proto/rust-vendored proto/go crates/proto/src/gen ; do
+for d in proto/rust-vendored crates/proto/src/gen ; do
     rm -r "${repo_root}/${d}/"
     mkdir -p "${repo_root}/${d}/"
 done
@@ -22,10 +22,6 @@ buf export penumbra --output rust-vendored/
 # those directly in this repo, and don't need to duplicate them as output.
 rm -rf rust-vendored/penumbra/
 
-echo "Generating golang code..."
-buf generate
-popd
-
 echo "Generating rust code..."
 pushd "${repo_root}/tools/proto-compiler"
 cargo run