fix(longhorn): Make identification of resources unique

This patch adds the namespace to the kustomize specification to make the
identification unique enough so it no longer has to complain.

Suggestion was taken from a GitHub Issue:

https://github.com/kubernetes-sigs/kustomize/issues/2806

infrastructure/longhorn/release.yaml

@@ -27,6 +27,7 @@ spec:
             apiVersion: apps/v1
             metadata:
               name: longhorn-driver-deployer
+              namespace: longhorn-system
             spec:
               template:
                 spec:
@@ -43,6 +44,7 @@ spec:
             apiVersion: apps/v1
             metadata:
               name: longhorn-manager
+              namespace: longhorn-system
             spec:
               template:
                 spec: