Prompt for Internal LBs with no Public IPs

[mbrat2005]

1. Internal LBs where VMs do not have assigned public IP addresses will have no outbound internet access post migration due to SNAT behavior change between Basic and Standard LBs. Prompt the user to confirm and acknowledge that they will need to add a NAT Gateway or public IP configuration post migration.
2. Add VMSSes with PublicIPConfigurations to unsupported migration scenarios because the assigned PIPs will be basic and would conflict with the Standard LB PIPs post-migration. Support to automate removing and readding the PIP configuration post migration could be added

[mbrat2005]

#11