Add RepoOriginalSourceRevisionId as assembly metadata

[BrennanConroy]

We just updated aspnetcore to include the commit hash for the dotnet/aspnetcore repo that the VMR build is based on (roughly) in the assembly metadata. See dotnet/dotnet#1572

It'd be nice if the runtime repo did this as well. It will help scenarios like benchmarking where we gather the commit hashes of assemblies to help find where a regression (or improvement) occurred.

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[jeffhandley]

@ViktorHofer Is this feasible for you to pull into .NET 10?

[ViktorHofer]

I'm still on the pessimistic side about implementing this change as shared here. I understand the motivation but I don't like that this information reaches our customers.