build: remove protobuf generation code

Author: vbarua

buf.gen.yaml

@@ -2,24 +2,9 @@
 
 set -eou pipefail
 
-namespace=substrait.gen.proto
 submodule_dir=./third_party/substrait
-src_dir="$submodule_dir"/proto
-tmp_dir=./buf_work_dir
-dest_dir=./src
 extension_dir=./src/substrait/extension_files
 
-# Prefix the protobuf files with a unique configuration to prevent namespace conflicts
-# with other substrait packages. Save output to the work dir.
-python "$submodule_dir"/tools/proto_prefix.py "$tmp_dir" "$namespace" "$src_dir"
-
-# Remove the old python protobuf files
-rm -rf "$dest_dir/substrait/gen/proto"
-
-# Generate the new python protobuf files
-buf generate
-find "$dest_dir/substrait/gen" -type d -exec touch {}/__init__.py \;
-
 # Remove the old extension files
 rm -rf "$extension_dir"
 
@@ -29,6 +14,3 @@ find "$extension_dir" -type f -exec chmod u+rw {} +
 
 # Ensure there's an __init__.py file in the extension directory
 touch $extension_dir/__init__.py
-
-# Remove the temporary work dir
-rm -rf "$tmp_dir"