added namespace field in the namespace scoped resource templates of helm chart (#7256)

* added namespace field in the namespace scoped resource templates of helm chart

* moved namespace field from roleRef to metadata

charts/ingress-nginx/templates/controller-poddisruptionbudget.yaml

@@ -6,6 +6,7 @@ metadata:
     {{- include "ingress-nginx.labels" . | nindent 4 }}
     app.kubernetes.io/component: controller
   name: {{ include "ingress-nginx.controller.fullname" . }}
+  namespace: {{ .Release.Namespace }}
 spec:
   selector:
     matchLabels: