Fix muxer version handling for dotnetup (and installation library) #51691
Description
When installing the .NET SDK or runtime, there may be existing versions of the muxer installed in the dotnet root. We should install a new one if it is newer than the existing one. Currently DotnetArchiveExtractor tries to do this but does it incorrectly by comparing SDK versions to runtime versions.
If possible, the right way to do this is to probably look at the file metadata for the existing version and the version coming from the new install, to determine which one is newer.