n8n: decommission old n8n-secret (remove empty stub + ignoreDifferences)

3c: n8n now sources the encryption key from n8n-secret-infisical (Infisical).
Remove the empty CreateOnly stub manifest and the now-dead ignoreDifferences
/data stanza so ArgoCD prunes the old out-of-band n8n-secret.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

n8n/secret-n8n-secret.yaml

@@ -1,13 +0,0 @@
-apiVersion: v1
-kind: Secret
-metadata:
-  name: n8n-secret
-  namespace: n8n
-  annotations:
-    # CreateOnly: ArgoCD creates this secret if it doesn't exist but never overwrites it.
-    # Populate the key manually before first deploy:
-    #   kubectl create secret generic n8n-secret \
-    #     --from-literal=encryption-key='<value-from-vaultwarden>' \
-    #     -n n8n --dry-run=client -o yaml | kubectl apply -f -
-    argocd.argoproj.io/sync-options: "CreateOnly=true"
-type: Opaque