REFACTOR(cnpg): change CNPG namespace

- Update namespace configuration
- Standardize naming

cnpg/namespace.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 kind: Namespace
 metadata:
-  name: cnpg-system
+  name: cnpg
   labels:
     goldilocks.fairwinds.com/enabled: "true"