fix(puppet): remove explicit clusterIP: null from puppetdb Service

Setting clusterIP: null means ArgoCD's desired state has null but the
live cluster assigns a real IP on creation. This causes permanent
OutOfSync as the two values never match. Removing the field lets the
API server own it without ArgoCD competing.

apps/base/puppet/service_puppetdb.yaml

@@ -9,7 +9,6 @@ metadata:
   name: puppetdb
   namespace: puppet
 spec:
-  clusterIP: null
   ports:
   - name: pdb-http
     port: 8080