Adding VM and VMSS force deletion example for Resource Group Delete (#12719)

* add vmss capabilities to force delete

* Add example for VM and VMSS force deletion

Author: tjegbejimba

specification/resources/resource-manager/Microsoft.Resources/stable/2020-06-01/examples/ForceDeleteVMsAndVMSSInResourceGroup.json

@@ -0,0 +1,16 @@
+{
+  "parameters": {
+    "subscriptionId": "00000000-0000-0000-0000-000000000000",
+    "resourceGroupName": "my-resource-group",
+    "forceDeletionResourceTypes": "Microsoft.Compute/virtualMachines,Microsoft.Compute/virtualMachineScaleSets",
+    "api-version": "2020-06-01"
+  },
+  "responses": {
+    "202": {
+      "description": "Accepted"
+    },
+    "200": {
+      "description": "OK"
+    }
+  }
+}

specification/resources/resource-manager/Microsoft.Resources/stable/2020-06-01/resources.json

@@ -2508,6 +2508,9 @@
         "x-ms-examples": {
           "Force delete all the Virtual Machines in a resource group": {
             "$ref": "./examples/ForceDeleteVMsInResourceGroup.json"
+          },
+          "Force delete all the Virtual Machines and Virtual Machine Scale Sets in a resource group": {
+            "$ref": "./examples/ForceDeleteVMsAndVMSSInResourceGroup.json"
           }
         },
         "responses": {