Address System.Net.Http.WinHttpHandler's nullable warnings targeting .NETCoreApp #54598
Description
When adding a NetCoreAppCurrent TFM to System.Net.Http.WinHttpHandler, more than 100 nullable warnings pop up that would need to be addressed.
Meanwhile the <Nullable> setting for NetCoreAppCurrent is set to annotations only, to avoid the warnings in the build.
Related: #54012