Replace ItemGroup item with Copy task to see if that fixes xunit/xunit#1651

Author: bradwilson

src/xunit.runner.visualstudio/build/xunit.runner.visualstudio.desktop.props

@@ -6,11 +6,6 @@
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <Visible>False</Visible>
     </None>
-    <None Include="$(MSBuildThisFileDirectory)xunit.abstractions.dll">
-      <Link>xunit.abstractions.dll</Link>
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-      <Visible>False</Visible>
-    </None>
     <None Include="$(MSBuildThisFileDirectory)xunit.runner.reporters.net452.dll">
       <Link>xunit.runner.reporters.net452.dll</Link>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>

src/xunit.runner.visualstudio/build/xunit.runner.visualstudio.targets

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Target Name="XunitVSTestCopyAbstractions" AfterTargets="Build">
+    <Copy SourceFiles="$(MSBuildThisFileDirectory)xunit.abstractions.dll" DestinationFolder="$(OutputPath)" SkipUnchangedFiles="true" />
+  </Target>
+</Project>

src/xunit.runner.visualstudio/xunit.runner.visualstudio.nuspec

@@ -31,9 +31,11 @@
 
     <file target="build\net462\" src="bin\$Configuration$\net462\xunit.*.dll" />
     <file target="build\net462\xunit.runner.visualstudio.props" src="build\xunit.runner.visualstudio.desktop.props" />
+    <file target="build\net462\xunit.runner.visualstudio.targets" src="build\xunit.runner.visualstudio.targets" />
 
     <file target="build\net6.0\" src="bin\$Configuration$\net6.0\xunit.*.dll" />
     <file target="build\net6.0\xunit.runner.visualstudio.props" src="build\xunit.runner.visualstudio.dotnetcore.props" />
+    <file target="build\net6.0\xunit.runner.visualstudio.targets" src="build\xunit.runner.visualstudio.targets" />
 
     <file target="lib\net462\" src="build\_._" />