Remove unnecessary reference to iOS workload pack in the Mono workload

[steveisok]

The pack no longer exists and will cause an error when trying to import.

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[steveisok]

/backport to release/6.0-preview5

[github-actions]

Started backporting to release/6.0-preview5: https://github.com/dotnet/runtime/actions/runs/885736064

[spouliot]

@steveisok what are the difference between

<Import Project="Sdk.props" Sdk="Microsoft.NETCore.App.Runtime.AOT.Cross.tvos-x64" /> and
<Import Project="Sdk.props" Sdk="Microsoft.NETCore.App.Runtime.AOT.Cross.tvossimulator" />

Is the later an arm64 version for the tvOS simulator (on M1) ?
If so why is it named this way ?

[steveisok]

@steveisok what are the difference between

<Import Project="Sdk.props" Sdk="Microsoft.NETCore.App.Runtime.AOT.Cross.tvos-x64" /> and
<Import Project="Sdk.props" Sdk="Microsoft.NETCore.App.Runtime.AOT.Cross.tvossimulator" />

Is the later an arm64 version for the tvOS simulator (on M1) ?
If so why is it named this way ?

I think x64 is another unnecessary reference.

As for tvossimulator, it will import the right pack depending on if you're targeting arm64 or x64. The alias is intended to make the installer smart about what packs to include.

"Microsoft.NETCore.App.Runtime.AOT.Cross.tvossimulator": {
      "kind": "Sdk",
      "version": "${PackageVersion}",
      "alias-to": {
        "osx-arm64": "Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.tvossimulator-arm64",
        "osx-x64": "Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.tvossimulator-x64"
      }
    },

The naming of the aot compiler packs follow the format of Microsoft.NETCore.App.Runtime.AOT.<host_os-arch>.Cross.<target_os-arch>. Since there's a supported rid for iOS/tvOS and iOS/tvOSSimulator, we generate the appropriate aot compiler packs.

[lewing]

I'm tempted to add a check that we aren't trying to load missing aliases. We can dot e2e install tests other places but we'd need a non abstract definition here.