Ability to choose NLB when deploying to ECS

**Is your feature request related to a problem? Please describe.**
When deploying a .NET solution to ECS, you can choose to create an ALB but not NLB. There are many reasons an NLB might be preferred. In my case I plan to host behind an API Gateway. API Gateway only supports VPC Links to an NLB.

**Describe the solution you'd like**
Let me choose the ELB type at launch

**Describe alternatives you've considered**
For the moment I have to authenticate the request from API Gateway to ALB. VPC links would be much easier.

**Additional context**
See warning at the bottom of this page https://net-modernization.workshop.aws/lab4/part1.html

No repository file or test is named in the issue. Start by tracing the ECS deployment entry point and where the launch flow selects ALB creation; use the linked AWS workshop warning to confirm the NLB/VPC Link requirement, and consider the work done when launch lets the user select the ELB type.

Written by the indexing model from the issue text.