Fix the Whitelisted IPs on EKS Node Groups

[rfuelsh]

due to eks node group terraform module inheriting the cluster security group instead of using its own- https://github.com/terraform-aws-modules/terraform-aws-eks/issues/1889 - some defect/missing with this terraform module, our nodes have open/public IPs and ports

Its better to provision new nodes with their own separate security group that is private and then slowly migrate DEV and PROD clusters to them