Remove NuGet.Packaging.Core, as it's an assembly that only contains forwarders #468

Job	Run time
Test (ubuntu-20.04, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,Om...	8m 24s
Test (ubuntu-20.04, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,Om...	8m 23s
Test (ubuntu-20.04, OmniSharp.DotNetTest.Tests)	8m 58s
Test (ubuntu-20.04, OmniSharp.DotNetTest.Tests)	9m 27s
Test (windows-2022, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,Om...	16m 40s
Test (windows-2022, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,Om...	13m 34s
Test (windows-2022, OmniSharp.DotNetTest.Tests)	17m 17s
Test (windows-2022, OmniSharp.DotNetTest.Tests)	14m 50s
Test (macos-11, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,OmniSh...	31m 59s
Test (macos-11, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,OmniSh...	31m 59s
Test (macos-11, OmniSharp.DotNetTest.Tests)	18m 53s
Test (macos-11, OmniSharp.DotNetTest.Tests)	18m 53s
	3h 19m 17s

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