Enable bundling NativeAOT NuGet packages from runtime on non-vmr builds.

[tmds]

The NativeAOT bundeling added in #41198 is copying NuGet packages directly from the runtime repo build output:

sdk/src/Installer/redist-installer/targets/GenerateLayout.targets

Lines 212 to 214 in 01aab34

	<BundledLayoutLibraryPackage Include="$(SourceBuiltShippingPackagesDir)/../runtime/Microsoft.DotNet.ILCompiler.$(MicrosoftNETCoreAppRuntimePackageVersion).nupkg" Condition="'$(BundleNativeAotCompiler)' == 'true'" />
	<BundledLayoutLibraryPackage Include="$(SourceBuiltShippingPackagesDir)/../runtime/Microsoft.NET.ILLink.Tasks.$(MicrosoftNETILLinkTasksPackageVersion).nupkg" Condition="'$(BundleNativeAotCompiler)' == 'true'" />

This location is not available when the SDK is built outside of the vmr.

This issue is for replacing that copy with obtaining the packages through a NuGet source. See #41198 (comment).

When this is working the, the DotNetBuildOrchestrator condition can be removed here:

sdk/src/Installer/redist-installer/redist-installer.csproj

Lines 11 to 12 in 01aab34

	<!-- DotNetBuildOrchestrator is (currently) needed in order to obtain NuGet packages from the runtime build. -->
	<BundleNativeAotCompiler Condition="'$(BundleNativeAotCompiler)' == '' and '$(DotNetBuildSourceOnly)' == 'true' and '$(SourceBuildUseMonoRuntime)' != 'true' and '$(DotNetBuildOrchestrator)' == 'true'">true</BundleNativeAotCompiler>

cc @ViktorHofer