Remove leftover cswinrt.vcxproj project references (#2479)

The native cswinrt.exe projection generator was ported to C# and src/cswinrt/cswinrt.vcxproj was deleted (#2440), but three authoring test projects still had stale ProjectReference entries pointing at it. Remove them from AuthoringTest2, AuthoringTest3, and AuthoringConsumptionTest2.AOT.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: Sergio0694

src/Tests/AuthoringConsumptionTest2.AOT/AuthoringConsumptionTest2.AOT.csproj

@@ -20,7 +20,6 @@
     <ProjectReference Include="..\AuthoringTest2\AuthoringTest2.csproj" />
     <ProjectReference Include="..\..\Projections\Windows\Windows.csproj" />
     <ProjectReference Include="..\..\Authoring\WinRT.SourceGenerator2\WinRT.SourceGenerator2.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
-    <ProjectReference Include="..\..\cswinrt\cswinrt.vcxproj" />
   </ItemGroup>
 
   <ItemGroup>

src/Tests/AuthoringTest2/AuthoringTest2.csproj

@@ -12,7 +12,6 @@
   <ItemGroup>
     <ProjectReference Include="..\..\Projections\Windows\Windows.csproj" />
     <ProjectReference Include="..\..\Authoring\WinRT.SourceGenerator2\WinRT.SourceGenerator2.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
-    <ProjectReference Include="..\..\cswinrt\cswinrt.vcxproj" />
   </ItemGroup>
 
 </Project>

src/Tests/AuthoringTest3/AuthoringTest3.csproj

@@ -12,7 +12,6 @@
   <ItemGroup>
     <ProjectReference Include="..\..\Projections\Windows\Windows.csproj" />
     <ProjectReference Include="..\..\Authoring\WinRT.SourceGenerator2\WinRT.SourceGenerator2.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
-    <ProjectReference Include="..\..\cswinrt\cswinrt.vcxproj" />
   </ItemGroup>
 
 </Project>