Add output task parameter to targets for DebugSymbolsFiles

Author: ocalles

src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.PackageDependencyResolution.targets

@@ -297,6 +297,7 @@ Copyright (c) .NET Foundation. All rights reserved.
       <Output TaskParameter="Analyzers" ItemName="ResolvedAnalyzers" />
       <Output TaskParameter="ApphostsForShimRuntimeIdentifiers" ItemName="_ApphostsForShimRuntimeIdentifiersResolvePackageAssets" />
       <Output TaskParameter="ContentFilesToPreprocess" ItemName="_ContentFilesToPreprocess" />
+      <Output TaskParameter="DebugSymbolsFiles" ItemName="DebugSymbolsFiles" />
       <Output TaskParameter="FrameworkAssemblies" ItemName="ResolvedFrameworkAssemblies" />
       <Output TaskParameter="FrameworkReferences" ItemName="TransitiveFrameworkReference" />
       <Output TaskParameter="NativeLibraries" ItemName="NativeCopyLocalItems" />