Ship Microsoft.DotNet.Web.ProjectTemplates.2.1 in servicing builds

[JunTaoLuo]

We need to ensure this package is pushed to NuGet for the template search functionality. The change will be on the line: https://github.com/aspnet/AspNetCore/blob/6ed7bf85b198a22a3cdd5b61c4eca5657959dadc/build/artifacts.props#L147

[JunTaoLuo]

cc @mkArtakMSFT

I see that in 2.2 we ship all of the template packages:

    <PackageArtifact Include="Microsoft.DotNet.Web.Client.ItemTemplates" Category="ship" />
    <PackageArtifact Include="Microsoft.DotNet.Web.ItemTemplates" Category="ship" />
    <PackageArtifact Include="Microsoft.DotNet.Web.ProjectTemplates.2.2" Category="ship" />
    <PackageArtifact Include="Microsoft.DotNet.Web.Spa.ProjectTemplates.2.2" Category="ship" />

Should we just do that in 2.1 as well and ship all 4 template packages?

[mkArtakMSFT]

For 2.2 we've updated the Spa.ProjectTemplates just recently.
We need to make these two in 2.1:

<PackageArtifact Include="Microsoft.DotNet.Web.ProjectTemplates.2.2" Category="ship" />
<PackageArtifact Include="Microsoft.DotNet.Web.Spa.ProjectTemplates.2.2" Category="ship" />

[JunTaoLuo]

I'll keep an eye out for merging 2.1=>2.2=>master PRs.