[Windows] postdotnet: delete nuget.conf if exists (#4013)

* postdotnet: delete nuget.conf if exists

* rename to $nugetConfigPath

* add nuget.config check test

* remove issue link

images/win/post-generation/Dotnet.ps1

@@ -7,8 +7,5 @@ if (-not $latestPath.Contains($dotnetPath))
     [System.Environment]::SetEnvironmentVariable('PATH', $latestPath, [System.EnvironmentVariableTarget]::Machine)
 }
 
-# Delete empty nuget.config file created by choco and recreate the config using the 'dotnet nuget list source command'
-# before choco or powershell’s ancient embedded nuget does to prevent the issue with downloading packages from nuget.org
-# https://github.com/actions/virtual-environments/issues/3038
-Remove-Item $env:APPDATA\NuGet\NuGet.Config -Force
+# Recreate the config using the 'dotnet nuget list source command'
 dotnet nuget list source

images/win/scripts/Tests/ChocoPackages.Tests.ps1

@@ -44,6 +44,9 @@ Describe "Nuget" {
     It "Nuget" {
        "nuget" | Should -ReturnZeroExitCode
     }
+    It "NuGet.Config not exists" {
+        "$env:APPDATA\NuGet\NuGet.Config" | Should -Not -Exist
+    }
 }
 
 Describe "OpenSSL" {