Update build pipeline to publish source-build packages

[MichaelSimons]

Fixes #33343

Here is a test build (internal link): https://dnceng.visualstudio.com/internal/_build/results?buildId=1188339&view=results

[MichaelSimons]

Can't use $(ArtifactsDir)**\*.sha512 with source build as the inner clone gets searched and picks up the checksums of some packages that get restored.

[JunTaoLuo]

FYI @dotnet/aspnet-build. I assume it's verified all our *.sha512 files are from installers and packages in both public and internal builds?

[MichaelSimons]

Upon taking a second look. It not necessary to scan packages because we only generate checksums for items in installers - https://github.com/dotnet/aspnetcore/blob/main/eng/AfterSigning.targets#L21

[wtgodbe]

Yep, just installers

[JunTaoLuo]

Looks good, assuming we've verified we aren't missing any existing .sha512 files that's currently included in publishing.

[MichaelSimons]

Looks good, assuming we've verified we aren't missing any existing .sha512 files that's currently included in publishing.

I compared the test build against the most recent build of main and see the same checksum files being published to the BlobArtifacts folder.