Fixed issue with delete resource group (#3259)

* Added a check to still pass if the resource group wasn't found. Typically this happens based on a timeout and then re-running it wouldn't find the RG.

build/jobs/cleanup.yml

@@ -11,7 +11,15 @@ jobs:
       azureSubscription: $(ConnectedServiceName)
       azurePowerShellVersion: latestVersion
       ScriptType: InlineScript
-      Inline: 'Get-AzResourceGroup -Name $(ResourceGroupName) | Remove-AzResourceGroup -Verbose -Force'
+      Inline: |
+        Get-AzResourceGroup -Name $(ResourceGroupName) -ErrorVariable notPresent -ErrorAction SilentlyContinue 
+        if ($notPresent) {
+          Write-Host "Resource group $(ResourceGroupName) not found"
+        } else {
+          Write-Host "Deleting resource group $(ResourceGroupName)"
+          Remove-AzResourceGroup -Name $(ResourceGroupName) -Force -Verbose
+        }
+      
 
 - template: ./cleanup-aad.yml