Dual-write ENC data into encapi alongside Cobbler

Seed encapi (statuses, roles, prodnxsr node assignments) and make the
instance module also create an encapi_node for every VM, so the k8s
puppetserver ENC can cut over from Cobbler. Cobbler/puppetca/puppetdb
resources are left untouched.

- Add config/encapi leaf + modules/encapi driving statuses/roles/nodes
  from YAML (3 statuses, 51 roles, 13 prodnxsr physical nodes).
- Add encapi_node to modules/instance (certname, role, environment).
- Wire encapi provider into root.hcl required_providers and the module
  providers; plumb ENCAPI_WRITE_TOKEN via Makefile vault_env.

Makefile

@@ -10,6 +10,7 @@ define vault_env
 	export PUPPET_CERT_CA=$$(vault kv get -field=public_key kv/service/puppet/certificates/ca) && \
 	export PUPPET_CERT_PUB=$$(vault kv get -field=public_key kv/service/puppet/certificates/terraform) && \
 	export PUPPET_CERT_PRIV=$$(vault kv get -field=private_key kv/service/puppet/certificates/terraform) && \
+	export ENCAPI_WRITE_TOKEN=$$(vault kv get -field=ENCAPI_WRITE_TOKEN kv/kubernetes/namespace/encapi/default/environment) && \
 	export TG_QUEUE_EXCLUDE_DIR="templates/base" && \
 	export TG_PROVIDER_CACHE=1 && \
 	export TG_TF_PATH=terraform && \