CloudFormation template for creating EKS clusters

What does this MR do?

CloudFormation template for creating EKS clusters

Creates the cluster itself, a group of worker nodes, and the networking rules to allow them to communicate.

Assumes that a VPC, an IAM service role, subnets and security group have already been created and will be passed as parameters.

The nodes must wait for the cluster to finish creating as they need to register with the cluster on launch, which will fail if the cluster has yet to finish creating.

Based on the AWS sample for creating worker nodes, with a AWS::EKS::Cluster resource added: https://amazon-eks.s3-us-west-2.amazonaws.com/cloudformation/2019-02-11/amazon-eks-nodegroup.yaml

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Performance and Testing

• [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team

#22392 (closed)