Support runtimecopylocal to enable cswinrt

[wli3]

fix #11556

Pending NuGet/NuGet.Client#3479 . Currently use a temp implementation.
Pending #12202 , so we can remove explicit definition in for TargetPlatformIdentifier and TargetPlatformVersion
Pending an edit in KnownFrameworkReference, when Microsoft.Windows.SDK.NET.Ref is ready

test project (Cannot make an automated test now since the windows package is not pushed to a feed):

<Project Sdk="Microsoft.NET.Sdk">

	<ItemGroup>
    	<KnownFrameworkReference Include="Microsoft.Windows.SDK.NET.Ref"
                              TargetFramework="net5.0-windows10.0.18362"
                              RuntimeFrameworkName="Microsoft.Windows.SDK.NET.Ref"
                              DefaultRuntimeFrameworkVersion="10.0.18362.1-preview"
                              LatestRuntimeFrameworkVersion="10.0.18362.1-preview"
                              TargetingPackName="Microsoft.Windows.SDK.NET.Ref"
                              TargetingPackVersion="10.0.18362.1-preview"
                              RuntimePackNamePatterns="Microsoft.Windows.SDK.NET.Ref"
							  RuntimePackRuntimeIdentifiers="any"
							  RuntimeCopylocal="true"
							  IsWindowsOnly="true"
                              />
	</ItemGroup>

	<PropertyGroup>
		<OutputType>Exe</OutputType>
		<TargetFramework>net5.0</TargetFramework>
		<TargetPlatformIdentifier>Windows</TargetPlatformIdentifier>
		<TargetPlatformVersion>10.0.18362</TargetPlatformVersion>
	</PropertyGroup>

</Project>

[wli3]

#12231

[wli3]

nuget change is still not ready. I will check it in for now.

[ghost]

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[ghost]

Apologies, while this PR appears ready to be merged, I've been configured to only merge when all checks have explicitly passed. The following integrations have not reported any progress on their checks and are blocking auto-merge:

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4. Dependabot

These integrations are possibly never going to report a check, and unblocking auto-merge likely requires a human being to update my configuration to exempt these integrations from requiring a passing check.

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