Add parameter to avoid random number in groups email address

[pretzer]

The function New-AADUnifiedGroup contains this code to add a random number to the mail address of the group:

$randomNum = (Get-Random -Maximum 1000).tostring()
$mailNickname = $GroupName.Replace(" ", "") + $randomNum

This should be optional by introducing a parameter to turn the behavior off.
Thank you for consideration!