'yarn cleaninstall' now requires protoc to be available for the
rust-node-addon package to successfully build.

Move install_protobuf.sh to a shared location as non-android workflows may
need to use the script

https://buildkite.com/comm/android-build/builds/9597#0185a732-17b0-4b0f-aad2-40d30bba8c06 passes