Replace NuGet.Frameworks nuget to workaround FLE

Previous commit adding the nuget reference didn't work. This is
a workaround that works:
dotnet/roslyn#61454 (comment)

tests/FSharpLint.FunctionalTest/FSharpLint.FunctionalTest.fsproj

@@ -20,6 +20,13 @@
  <PackageReference Include="Microsoft.NET.Test.Sdk" />
  <PackageReference Include="FSharp.Compiler.Service" />
  <PackageReference Include="Microsoft.Build.Locator" />
- <PackageReference Include="NuGet.Frameworks" />
  </ItemGroup>
+
+ <!-- workaround for NuGet.Frameworks FileLoadException issue,
+ see https://github.com/dotnet/roslyn/issues/61454#issuecomment-1191209761 -->
+ <Target Name="PostBuild" AfterTargets="PostBuildEvent">
+ <Copy SourceFiles="$(MSBuildSDKsPath)\..\NuGet.Frameworks.dll"
+ DestinationFolder="$(OutputPath)"
+ ContinueOnError="false" />
+ </Target>
 </Project>