Determine Type of .NET App from build file

[alexyaang]

When scaffolding docker files, we prompt the user with the following, including ".NET: ASP.NET Core" and ".NET: Console". However, we could determine the type of .NET file by looking at the .csproj file. In other words, we can consolidate the two into one called ".NET" option and use code logic to determine whether it's a web app. After this, we can also do something similar with Python to prompt users with less options to avoid confusion.