Clean up contents from previously-sb tarball post binary-cleanup #40772
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If we extracted the previously-source-build tarball only for running the binary cleanup tool, clean up the extracted contents. This undo's the extraction operation that was only performed for running the binary-cleanup tool.
I am creating a tarball for building .NET offline post-prep. In that scenario, I run ./prep-source-build.sh --bootstrap, and then package up the entire VMR directory into a tarball. Without this cleanup, there are a ton of duplicated binaries in the tarball, since the nuget packages are both in previously-source-built archive and in an extracted form. With this change, the archive size goes from just over 4GB to just over 2GB.
This is a port of dotnet/installer#19632 from installer to sdk.