feat: Add support for AL2023 nodeadm user data (#2942)

examples/user_data/templates/al2023_custom.tpl

@@ -0,0 +1,14 @@
+%{ if enable_bootstrap_user_data ~}
+---
+apiVersion: node.eks.aws/v1alpha1
+kind: NodeConfig
+spec:
+  cluster:
+    name: ${cluster_name}
+    apiServerEndpoint: ${cluster_endpoint}
+    certificateAuthority: ${cluster_auth_base64}
+  containerd:
+    config: |
+      [plugins."io.containerd.grpc.v1.cri".containerd]
+      discard_unpacked_layers = false
+%{ endif ~}