Switch to new Microsoft.DotNet.SharedFramework.Sdk and refactor Host/Installer build subsets

[jkoritzinsky]

Use the new Microsoft.DotNet.SharedFramework.Sdk to build the Microsoft.NETCore.App shared framework, targeting pack, apphost pack, dotnet-host installer, dotnet-hostfxr installer, runtime-deps installers, and the bundle installers.

This PR also replaces the subsets in the installer space with the following subsets:

Parent Subset	Subset Name	Subset Contents
host
host	host.native	Native build for dotnet.exe, apphost, hostpolicy, hostfxr, etc.
host	host.pkg	NuGet packages for hostpolicy, hostfxr, dotnet shared host
host	host.tools	HostModel assembly
host	host.tests	Tests for apphost, hostpolicy, hostfxr, dotnet shared host, HostModel, etc.
packs
packs	packs.product	Microsoft.NETCore.App.Ref/Runtime/Host/Crossgen2 framework packs, installers, archives. dotnet-host, dotnet-hostfxr, runtime-debs, and bundle installers.
packs.product	packs.installers	Microsoft.NETCore.App.Ref/Runtime/Host, dotnet-host/hostfxr, bundle installers
packs	packs.tests	Tests for the runtime packs.
publish		Generate asset manifests and prepare to publish to BAR.

Fixes #3730
Fixes #1616
Fixes #1622
Fixes #44320

[jkoritzinsky]

Marking no merge again until this PR can consume a Microsoft.DotNet.Build.Tasks.Installers with dotnet/arcade#6549

[jkoritzinsky]

Once we have that, we can merge this PR.

[hoyosjs]

@jkoritzinsky just fyi, the PBsign changes got merges

[jkoritzinsky]

I saw. I'm integrating them now locally and validating.

I'm going to remove the non PBsign path in Signing.props since it doesn't work any more (we'll still sign the DAC and DBI).

[ViktorHofer]

Fix for the wrong msbuild function name: dotnet/arcade#6552

[ghost]

Hello @jkoritzinsky!

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[akoeplinger]

Congrats 🎉

[mmitche]

@jkoritzinsky This PR removed this line, which will break post build signing. Post build signing breaks signing into two categories:

ItemsToSign and ItemsToSignPostBuild. ItemsToSign corresponds to those items that should always be signed during the build (when PostBuildSign is true or false), and ItemsToSignPostBuild should contain items to sign in post build, only if PostBuildSign = true.

The use of target should be unnecessary.

/cc @ViktorHofer

[mmitche]

I think that you will only need the setup for ItemGroupsWhen PostBuildSign=true. This does not need to be done in a target.

https://github.com/dotnet/runtime/pull/38457/files#diff-a923a7746e08ef5df4bfd49f340d9f93055d66ba792770a7e1c227b3eaf3d4efL146-L154

[jkoritzinsky]

Shoot. I’ll put out a PR to add back this item group.