fix: resolve idempotency drift in multiple_node_pools and appgw examples

- Add oidc_issuer_enabled = true to multiple_node_pools example to
  match Azure AKS API default behavior (same fix as named_cluster)
- Add actions to appgw subnet delegation to match Azure API response
  for Microsoft.Network/applicationGateways delegation

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lonegunmanb

examples/application_gateway_ingress/main.tf

@@ -63,7 +63,8 @@ resource "azurerm_subnet" "appgw" {
     name = "appgw-delegation"
 
     service_delegation {
-      name = "Microsoft.Network/applicationGateways"
+      name    = "Microsoft.Network/applicationGateways"
+      actions = ["Microsoft.Network/virtualNetworks/subnets/join/action"]
     }
   }
 }

examples/multiple_node_pools/main.tf

@@ -76,6 +76,7 @@ module "aks" {
   location                = local.resource_group.location
   os_disk_size_gb         = 60
   sku_tier                = "Standard"
+  oidc_issuer_enabled     = true
   private_cluster_enabled = false
   vnet_subnet = {
     id = azurerm_subnet.default_node_pool_subnet.id