Settings File template with build errors

[ocallesp]

Visual Studio Version:
Microsoft Visual Studio Enterprise 2019 Version 16.7.7
Microsoft Visual Studio Enterprise 2019 main Version 16.9.0 Preview 2.0 [30629.51.main]

Steps to Reproduce:

1. Create a Console App (Net Core)

2. Right-click on the project and add new item

3. Add the item Settings File

4. Build solution

Expected Behavior:
No compilation errors

Actual Behavior:
..\ConsoleApp30\Settings1.Designer.cs(16,76,16,99): error CS1069: The type name 'ApplicationSettingsBase' could not be found in the namespace 'System.Configuration'. This type has been forwarded to assembly 'System.Configuration.ConfigurationManager, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly.
1>Done building project "ConsoleApp30.csproj" -- FAILED.

User Impact:

[ocallesp]

@donJoseLuis

[ShreyasJejurkar]

Duplicate of #323