feat(scaffold-working-directory): support skipping to add aqua packages

[suzuki-shunsuke]

By default scaffold-working-directory creates aqua.yaml and add some packages.

aqua init
aqua g -i open-policy-agent/conftest terraform-linters/tflint aquasecurity/tfsec hashicorp/terraform

You can skip this.

tfaction-root.yaml

scaffold_working_directory:
  skip_adding_aqua_packages: true

You can configure packages and their versions in your template or you can also manage them in repository root's aqua.yaml.