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/eks-managed-node-group/variables.tf

@@ -303,6 +303,7 @@ variable "create_placement_group" {
   default     = false
 }
 
+# TODO - remove at next breaking change
 variable "placement_group_strategy" {
   description = "The placement group strategy"
   type        = string
@@ -337,6 +338,12 @@ variable "subnet_ids" {
   default     = null
 }
 
+variable "placement_group_az" {
+  description = "Availability zone where placement group is created (ex. `eu-west-1c`)"
+  type        = string
+  default     = null
+}
+
 variable "min_size" {
   description = "Minimum number of instances/nodes"
   type        = number