Opt out of metadata trimming (#2020)

Author: MichalStrehovsky

src/BenchmarkDotNet/Toolchains/NativeAot/Generator.cs

@@ -142,6 +142,9 @@ private string GenerateProjectForNuGetBuild(BuildPartition buildPartition, Artif
   <ItemGroup>
     <Compile Include=""{Path.GetFileName(artifactsPaths.ProgramCodePath)}"" Exclude=""bin\**;obj\**;**\*.xproj;packages\**"" />
   </ItemGroup>
+  <ItemGroup>
+    <TrimmerRootAssembly Include=""BenchmarkDotNet"" />
+  </ItemGroup>
   <ItemGroup>
     <PackageReference Include=""Microsoft.DotNet.ILCompiler"" Version=""{ilCompilerVersion}"" />
     <ProjectReference Include=""{GetProjectFilePath(buildPartition.RepresentativeBenchmarkCase.Descriptor.Type, logger).FullName}"" />