Enable NativeAOT dotnet CLI for Source Build

[baronfel]

Summary

• enable the NativeAOT dotnet CLI library for supported Source Build configurations
• make Source Build TargetRid an exact supported RID for the regular runtime packs and ILCompiler pack, matching the existing Arcade/ASP.NET Core pattern without enabling the legacy RID graph
• reuse the existing HostOS, TargetOS, OSName, BuildArchitecture, TargetArchitecture, CrossBuild, and NativeAotSupported properties when deciding whether the layout can publish dotnet-aot
• rely on the nested MSBuild invocation to inherit Source Build and target global properties; pass only _IsPublishing=true and, for same-OS cross-architecture publishing, CrossBuild=true explicitly
• preserve linux-musl, Mono, cross-OS, unsupported-architecture, and Linux cross-toolchain exclusions

Validation

• unified build 1514187 succeeded, including VMR Source-Only Build and SB_CentOSStream10_Online_MsftSdk_x64
• verified the CentOS Source Build publishes with RuntimeIdentifier=centos.10-x64 and UseRidGraph=false
• verified exact resolution of Microsoft.NETCore.App.Runtime.centos.10-x64, Microsoft.AspNetCore.App.Runtime.centos.10-x64, and Microsoft.NETCore.App.Runtime.NativeAOT.centos.10-x64
• verified the produced CentOS SDK tarball contains dotnet.dll and libdotnet-aot.so together under sdk/11.0.100-ci/
• verified a nested MSBuild invocation passing only _IsPublishing=true inherits the Source Build target properties and retains the same runtime-pack inference
• built and NativeAOT-published dotnet-aot.csproj for win-x64, and ran the NativeAOT CLI parser tests
• standard PR build 1514172 succeeded

Fixes #55283

[azure-pipelines]

Azure Pipelines:
Successfully started running 1 pipeline(s).
2 pipeline(s) were filtered out due to trigger conditions.
There may be pipelines that require an authorized user to comment /azp run to run.

[baronfel]

/azp run sdk-unified-build

[azure-pipelines]

Azure Pipelines:
Successfully started running 1 pipeline(s).

[baronfel]

/azp run sdk-unified-build

[azure-pipelines]

Azure Pipelines:
Successfully started running 1 pipeline(s).

[baronfel]

/azp run sdk-unified-build

[azure-pipelines]

Azure Pipelines:
Successfully started running 1 pipeline(s).

[azure-pipelines]

Azure Pipelines:
Successfully started running 1 pipeline(s).
2 pipeline(s) were filtered out due to trigger conditions.
There may be pipelines that require an authorized user to comment /azp run to run.

[baronfel]

/azp run sdk-unified-build

[azure-pipelines]

Azure Pipelines:
Successfully started running 1 pipeline(s).

[Copilot]

Pull request overview

Enables publishing the NativeAOT dotnet-aot shared library as part of the SDK layout for supported Source Build configurations, including distro-specific RIDs, while keeping existing exclusions (linux-musl, Mono, cross-OS, unsupported arch, and Linux cross-toolchain constraints).

Changes:

• Update layout gating for dotnet-aot publishing to use TargetOS/HostOS + NativeAotSupported (instead of RID-prefix checks) so Source Build distro-specific TargetRid is supported.
• Adjust the nested dotnet-aot publish invocation to rely on inherited global properties, only forcing _IsPublishing=true and (when applicable) CrossBuild=true.
• Extend known runtime/ILCompiler RID lists during Source Build so exact distro-specific pack RID matches work without enabling the portable RID graph.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/Layout/redist/targets/GenerateLayout.targets	Simplifies dotnet-aot publish property forwarding to rely on inherited global properties; keeps cross-build signaling via CrossBuild=true.
src/Layout/redist/redist.csproj	Updates the rationale for conditioning the dotnet-aot.csproj reference on _ShouldPublishDotnetAot, including Source Build behavior.
src/Layout/Directory.Build.props	Reworks _ShouldPublishDotnetAot gating to be OS/arch-based (and Source Build–friendly) and ties it to NativeAotSupported/Mono exclusions.
Directory.Build.targets	Adds $(TargetRid) to runtime pack and ILCompiler runtime identifier lists for Source Build to allow exact RID pack resolution without RID graph reliance.

[mthalman]

/azp run sdk-unified-build

[azure-pipelines]

Azure Pipelines:
Successfully started running 1 pipeline(s).

[mthalman]

Assuming UB pipeline is good, then I'm good.

[baronfel]

@mthalman looks like UB pipeline is good - we are getting libdotnet-aot.so binaries getting made. Merging!