Powershell script to get all group membership(UG or DL) and remove that user only to that group

You can combine the two scripts as follows. Here you search the groups where the user is member and then removes the user from those groups.

$email= read-host -prompt "user@domain.com"
$Mailbox=get-Mailbox $email
$DN=$mailbox.DistinguishedName
$Filter = "Members -like ""$DN"""
Get-DistributionGroup -ResultSize Unlimited -Filter $Filter | %{Remove-DistributionGroupMember -identity $_.name -Member $email -confirm:$false}
Get-UnifiedGroup -ResultSize Unlimited -Filter $Filter | %{Remove-UnifiedGroupLinks -Identity $_.name -LinkType Members -Links $email -Confirm:$false}