REFACTOR(traefik): switch ingress to Traefik

- Update ingressClassName from haproxy to traefik
- Update kubernetes-dashboard with Traefik backend SSL annotation

code-server/ingress.yaml

@@ -13,7 +13,7 @@ metadata:
     nginx.ingress.kubernetes.io/proxy-send-timeout: "3600"
     nginx.ingress.kubernetes.io/proxy-read-timeout: "3600"
 spec:
-  ingressClassName: haproxy
+  ingressClassName: traefik
   tls:
   - hosts:
     - vscode0213.kro.kr