Repo has old feeds

[richlander]

.NET version

main

Did it work in .NET Framework?

No

Did it work in any of the earlier releases of .NET Core or .NET 5+?

No

Issue description

This repo has old feeds registered. It isn't obvious that there is a policy to retire them. There should be.

https://github.com/dotnet/winforms/blob/b59247a3ef87ae25f51ccbe8806193a8f7eb79c6/NuGet.config#L7-L12

I notice that dotnet/runtime isn't using a .NET 7 feed, for example.

This is partially resolved by https://github.com/dotnet/winforms/pull/12175. However, I wonder why these feeds are all still there.

Steps to reproduce

No repro

[richlander]

I get this error if I remove dotnet8-transport for System.Drawing.Common.TestData. That should be resolved.

    C:\Users\rlander\git\winforms\src\System.Drawing.Common\tests\System.Drawing.Common.Tests.csproj : error NU1101: Unable to find package System.Drawing.Common.TestData. No packages exist with this id in source(s): dotnet-eng, dotnet-public, dotnet10. PackageSourceMapping is enabled, the following source(s) were not considered: dotnet-tools, dotnet10-transport, dotnet9-transport, richnav, winsdk.

[lonitra]

This is being covered by https://github.com/dotnet/winforms/pull/12249