[CI] Add HAB_AUTH_TOKEN to at-once update test
# Test the at-once service update strategy
+$env:HAB_AUTH_TOKEN = $env:PIPELINE_HAB_AUTH_TOKEN
+
$supLog = New-TemporaryFile
Start-Supervisor -LogFile $supLog -Timeout 45 | Out-Null
$testChannel="at-once-$([DateTime]::Now.Ticks)"
