Download Mono AOT workload .nupkg in prepare-artifacts.proj

[akoeplinger]

Fixes the official build failure after #51327 since the pattern we were using didn't include it.

Note: it sounds wrong to have these in RuntimeNupkgFile but I'm sending the PR to unblock the official build, we'll refactor it in a follow-up PR.

Test official build: https://dev.azure.com/dnceng/internal/_build/results?buildId=1120630&view=results

[ViktorHofer]

Are the Microsoft.NET.Sdk.Mono.Toolchain.Manifest.*.nupkg packages rid agnostic or specific?

[akoeplinger]

They're rid-agnostic, it's basically Microsoft.NET.Sdk.Mono.Toolchain.Manifest.6.0.0-preview.5.21253.8.nupkg

[ViktorHofer]

Cool. Can you please add to this item instead then?

runtime/src/installer/prepare-artifacts.proj

Line 219 in bde0bab

<RidAgnosticNupkgToPublishFile

[ViktorHofer]

Should we queue an official build to make sure this mitigates the build break?

[akoeplinger]

@ViktorHofer I queued one here (before your feedback): https://dev.azure.com/dnceng/internal/_build/results?buildId=1120630&view=results

Do you think we need another one after your feedback? Seems unlikely to break :)

[ViktorHofer]

Don't think we need another build. I believe the whole logic in this file is outdated and the separation of items actually doesn't do much.

[akoeplinger]

Official build passed, merging.