terraform tests: Fix up node definitions

Changed in MaterializeInc/terraform-aws-materialize#89

Test failures seen in https://buildkite.com/materialize/nightly/builds/14261

Author: def-

test/terraform/aws-persistent/main.tf

@@ -63,11 +63,14 @@ module "materialize_infrastructure" {
 
   # EKS Configuration
   cluster_version           = "1.31"
-  node_group_instance_types = ["r8g.2xlarge"]
-  node_group_desired_size   = 2
-  node_group_min_size       = 1
-  node_group_max_size       = 3
-  node_group_capacity_type  = "ON_DEMAND"
+  system_node_group_instance_types = ["r8g.2xlarge"]
+  system_node_group_desired_size   = 2
+  system_node_group_min_size       = 1
+  system_node_group_max_size       = 3
+  materialize_node_group_instance_types = ["r8g.2xlarge"]
+  materialize_node_group_desired_size   = 2
+  materialize_node_group_min_size       = 1
+  materialize_node_group_max_size       = 3
 
   # Storage Configuration
   bucket_force_destroy = true

test/terraform/aws-temporary/main.tf

@@ -91,11 +91,14 @@ module "materialize_infrastructure" {
 
   # EKS Configuration
   cluster_version           = "1.32"
-  node_group_instance_types = ["r7gd.2xlarge"]
-  node_group_desired_size   = 2
-  node_group_min_size       = 1
-  node_group_max_size       = 3
-  node_group_capacity_type  = "ON_DEMAND"
+  system_node_group_instance_types = ["r8g.2xlarge"]
+  system_node_group_desired_size   = 2
+  system_node_group_min_size       = 1
+  system_node_group_max_size       = 3
+  materialize_node_group_instance_types = ["r8g.2xlarge"]
+  materialize_node_group_desired_size   = 2
+  materialize_node_group_min_size       = 1
+  materialize_node_group_max_size       = 3
 
   # Storage Configuration
   bucket_force_destroy = true

test/terraform/aws-upgrade/main.tf

@@ -99,11 +99,14 @@ module "materialize_infrastructure" {
 
   # EKS Configuration
   cluster_version           = "1.32"
-  node_group_instance_types = ["r7gd.2xlarge"]
-  node_group_desired_size   = 2
-  node_group_min_size       = 1
-  node_group_max_size       = 3
-  node_group_capacity_type  = "ON_DEMAND"
+  system_node_group_instance_types = ["r8g.2xlarge"]
+  system_node_group_desired_size   = 2
+  system_node_group_min_size       = 1
+  system_node_group_max_size       = 3
+  materialize_node_group_instance_types = ["r8g.2xlarge"]
+  materialize_node_group_desired_size   = 2
+  materialize_node_group_min_size       = 1
+  materialize_node_group_max_size       = 3
 
   # Storage Configuration
   bucket_force_destroy = true