Stop publishing additional packages in `fsharp`

[NikolaMilosavljevic]

As part of enabling proper VMR publishing from inner-repos, we had to enable some repos to publish additional packages that are not collected by default arcade publishing infra.

Without changes in dotnet/fsharp#16838, we get 2 prebuilts due to the way Microsoft.FSharp.Compiler package is built. See dotnet/fsharp#16838 (comment) for more context.

This affects Linux source-only build.

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