docs: Move examples that are more like test cases to the new tests/ directory; add better example configurations (#3069)

* chore: Move examples that are more like test cases to the new `tests/` directory

* chore: Stash

* feat: Add better examples for EKS managed node groups

* chore: Add better examples for self-managed node groups

* chore: Update docs and correct `nodegroup` to `node group`

tests/user-data/templates/al2023_custom.tpl

@@ -0,0 +1,15 @@
+%{ if enable_bootstrap_user_data ~}
+---
+apiVersion: node.eks.aws/v1alpha1
+kind: NodeConfig
+spec:
+  cluster:
+    name: ${cluster_name}
+    apiServerEndpoint: ${cluster_endpoint}
+    certificateAuthority: ${cluster_auth_base64}
+    cidr: ${cluster_service_cidr}
+  containerd:
+    config: |
+      [plugins."io.containerd.grpc.v1.cri".containerd]
+      discard_unpacked_layers = false
+%{ endif ~}

tests/user-data/templates/bottlerocket_custom.tpl

@@ -0,0 +1,7 @@
+# Custom user data template provided for rendering
+[settings.kubernetes]
+"cluster-name" = "${cluster_name}"
+"api-server" = "${cluster_endpoint}"
+"cluster-certificate" = "${cluster_auth_base64}"
+
+${bootstrap_extra_args~}

tests/user-data/templates/linux_custom.tpl

@@ -0,0 +1,11 @@
+#!/bin/bash
+set -ex
+
+${pre_bootstrap_user_data ~}
+
+# Custom user data template provided for rendering
+B64_CLUSTER_CA=${cluster_auth_base64}
+API_SERVER_URL=${cluster_endpoint}
+/etc/eks/bootstrap.sh ${cluster_name} ${bootstrap_extra_args} --b64-cluster-ca $B64_CLUSTER_CA --apiserver-endpoint $API_SERVER_URL \
+    --ip-family ${cluster_ip_family} --service-${cluster_ip_family}-cidr ${cluster_service_cidr}
+${post_bootstrap_user_data ~}

tests/user-data/templates/windows_custom.tpl

@@ -0,0 +1,10 @@
+# Custom user data template provided for rendering
+<powershell>
+${pre_bootstrap_user_data ~}
+[string]$EKSBinDir = "$env:ProgramFiles\Amazon\EKS"
+[string]$EKSBootstrapScriptName = 'Start-EKSBootstrap.ps1'
+[string]$EKSBootstrapScriptFile = "$EKSBinDir\$EKSBootstrapScriptName"
+& $EKSBootstrapScriptFile -EKSClusterName ${cluster_name} -APIServerEndpoint ${cluster_endpoint} -Base64ClusterCA ${cluster_auth_base64} ${bootstrap_extra_args} 3>&1 4>&1 5>&1 6>&1
+$LastError = if ($?) { 0 } else { $Error[0].Exception.HResult }
+${post_bootstrap_user_data ~}
+</powershell>