Use Port 8080 with .NET 8 Containers

[simonkurtz-MSFT]

Please describe the feature.

Starting with .NET 8, port 8080 has become the default port (instead of port 80). We should move towards using port 8080 going forward.

As the new .NET 8 images use non-root users, port 80, which is a privileged port, needed to change to a non-privileged port to ensure non-root containers could function.