Remove "Is supported on this TFM" logic from marshalling generators and instead handle it during factory construction #91768
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The only generator that supports down-level is the LibraryImportGenerator, so remove this infrastructure from the base APIs and instead have LibraryImportGenerator create a different generator factory depending on the TFM.
Also, include #91765 as we would have had to separate out the legacy SafeHandle marshaller instantiation to a separate marshalling generator factory, but we don't use it anyway any more.