Update generate_go_protobuf.py for API in api/contrib (#17919)
Update generate_go_protobuf.py for API in api/contrib (#17919)

Signed-off-by: Yangmin Zhu <0d5d8bb6bbf2ecab2d72f973480958d5e0c38d66@google.com>
envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,lyft/envoy,lyft/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy