Add a `terraform_module_publish` boolean question (conditional on
`terraform`) that, when enabled, passes `include_module_publish`
and `module_system` inputs to the `terraform-build` CI component.

This allows teams to opt in to publishing their Terraform module
to the GitLab Terraform Module Registry on tag pipelines when
initializing a new project with copier.

common-ci-tasks#30

feat: add terraform module publish option to copier template

See merge request !611