Agora 2.0 -> fix Ubuntu custom script issues

[dkirby-ms]

• missing $resourceGroup parameter
• pindown connectedk8s version to 1.9.3 to address arc onboarding issue
• remove code for hyper-v shortcut for contoso_hypermarket

[dkirby-ms]

I agree, I thought it was working but the clusters both being named default is the issue.