[DOCS] remove obsolete debug guide (#9548)

docs/debugging-failed-builds.md

@@ -1,26 +0,0 @@
-# Debugging Failed Packer Builds
-
-## Step 1: Run packer build `-on-error=ask`
-When you run the `packer build` command, give it the `-on-error=ask` flag.
-By default, `packer build` will delete the resource group as soon as the build fails.
-`-on-error=ask` will pause it and wait for your input so you have time to remote in to the VM and diagnose the failure.
-
-When the build fails, you will see this:
-
-![Ask on error screenshot](/docs/resources/askOnError.png "Ask on error screenshot")
-
-## Step 2: Find the resource group name in the build log
-At the beginning of the build log (written to console), find the resource group name for the VM:
-
-![Resource group from log screenshot](/docs/resources/resourceGroupName.png "Resource group from log screenshot")
-
-Log into the Azure Portal.  Find that resource group under `Resource groups`.  You should see the resources for the Packer build:
-
-![Packer resource group in Azure screenshot](/docs/resources/packerResourceGroup.png "Packer resource group in Azure screenshot")
-
-## Step 3: Connect to the VM
-Select the VM in the resource group.  Click `Connect:`
-
-This will download an RDP file.  Open that and enter the credentials found in the HCL2 file you pass to `packer build`:
-
-![VM credentials screenshot](/docs/resources/vmCredentials.png "VM credentials screenshot")