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`

examples/self-managed-node-group/eks-bottlerocket.tf

@@ -0,0 +1,52 @@
+module "eks_bottlerocket" {
+  source  = "terraform-aws-modules/eks/aws"
+  version = "~> 20.0"
+
+  cluster_name    = "${local.name}-bottlerocket"
+  cluster_version = "1.30"
+
+  # EKS Addons
+  cluster_addons = {
+    coredns                = {}
+    eks-pod-identity-agent = {}
+    kube-proxy             = {}
+    vpc-cni                = {}
+  }
+
+  vpc_id     = module.vpc.vpc_id
+  subnet_ids = module.vpc.private_subnets
+
+  self_managed_node_groups = {
+    example = {
+      ami_type      = "BOTTLEROCKET_x86_64"
+      instance_type = "m6i.large"
+
+      min_size = 2
+      max_size = 5
+      # This value is ignored after the initial creation
+      # https://github.com/bryantbiggs/eks-desired-size-hack
+      desired_size = 2
+
+      # This is not required - demonstrates how to pass additional configuration
+      # Ref https://bottlerocket.dev/en/os/1.19.x/api/settings/
+      bootstrap_extra_args = <<-EOT
+        # The admin host container provides SSH access and runs with "superpowers".
+        # It is disabled by default, but can be disabled explicitly.
+        [settings.host-containers.admin]
+        enabled = false
+
+        # The control host container provides out-of-band access via SSM.
+        # It is enabled by default, and can be disabled if you do not expect to use SSM.
+        # This could leave you with no way to access the API and change settings on an existing node!
+        [settings.host-containers.control]
+        enabled = true
+
+        # extra args added
+        [settings.kernel]
+        lockdown = "integrity"
+      EOT
+    }
+  }
+
+  tags = local.tags
+}