feat: Enable update in place for node groups with cluster placement group strategy (#3045)

* feat(eks):added subnet az filter for eks nodegroup placement groups

* fix: Correct logice for restricting placement group to AZ

* fix: Ensure node group args are passed from root module

---------

Co-authored-by: Bryant Biggs <bryantbiggs@gmail.com>

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

@@ -256,6 +256,12 @@ variable "placement" {
   default     = {}
 }
 
+variable "create_placement_group" {
+  description = "Determines whether a placement group is created & used by the node group"
+  type        = bool
+  default     = false
+}
+
 variable "private_dns_name_options" {
   description = "The options for the instance hostname. The default values are inherited from the subnet"
   type        = map(string)
@@ -384,6 +390,12 @@ variable "availability_zones" {
   default     = null
 }
 
+variable "placement_group_az" {
+  description = "Availability zone where placement group is created (ex. `eu-west-1c`)"
+  type        = string
+  default     = null
+}
+
 variable "subnet_ids" {
   description = "A list of subnet IDs to launch resources in. Subnets automatically determine which availability zones the group will reside. Conflicts with `availability_zones`"
   type        = list(string)