feat: Allow users to selectively attach the EKS created cluster primary security group to nodes (#1952)

modules/self-managed-node-group/variables.tf

@@ -234,6 +234,12 @@ variable "vpc_security_group_ids" {
   default     = []
 }
 
+variable "cluster_primary_security_group_id" {
+  description = "The ID of the EKS cluster primary security group to associate with the instance(s). This is the security group that is automatically created by the EKS service"
+  type        = string
+  default     = null
+}
+
 variable "enable_monitoring" {
   description = "Enables/disables detailed monitoring"
   type        = bool