[dotnet] We're not bundling the runtimeconfig.json file.

It's parsed at build time (in the _CreateRuntimeConfiguration target), and stored
in a binary format, so we don't need the original json file.

dotnet/targets/Xamarin.Shared.Sdk.targets

@@ -1236,6 +1236,9 @@
 				            '%(ResolvedFileToPublish.NuGetPackageId)' == '$(_MonoNugetPackageId)'
 				            "
 			/>
+
+			<!-- We don't ship the runtimeconfig.json file -->
+			<ResolvedFileToPublish Remove="$(ProjectRuntimeConfigFilePath)" Condition="'$(GenerateRuntimeConfigurationFiles)' == 'true'" />
 		</ItemGroup>
 
 		<ComputeBundleLocation