[release/5.0-preview7] Disallow unrestricted polymorphic deserialization in DataSet #39314
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Fixes CVE-2020-1147
https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2020-1147
See also https://go.microsoft.com/fwlink/?linkid=2132227.
5.0-preview7 port from the release/3.1 branch. Only change was to the .csproj to account for some build system updates.