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/eks-managed-node-group/README.md

@@ -0,0 +1,23 @@
+# EKS Managed Node Group Examples
+
+Configuration in this directory creates Amazon EKS clusters with EKS Managed Node Groups demonstrating different configurations:
+
+- `eks-al2.tf` demonstrates an EKS cluster using EKS managed node group that utilizes the EKS Amazon Linux 2 optimized AMI
+- `eks-al2023.tf` demonstrates an EKS cluster using EKS managed node group that utilizes the EKS Amazon Linux 2023 optimized AMI
+- `eks-bottlerocket.tf` demonstrates an EKS cluster using EKS managed node group that utilizes the Bottlerocket EKS optimized AMI
+
+See the [AWS documentation](https://docs.aws.amazon.com/eks/latest/userguide/managed-node-groups.html) for additional details on Amazon EKS managed node groups.
+
+The different cluster configuration examples provided are separated per file and independent of the other cluster configurations.
+
+## Usage
+
+To provision the provided configurations you need to execute:
+
+```bash
+$ terraform init
+$ terraform plan
+$ terraform apply --auto-approve
+```
+
+Note that this example may create resources which cost money. Run `terraform destroy` when you don't need these resources.