Removing support for `UseLegacyDangerousClipboardDeserializationMode and `restrictDeserialization`

[vatsan-madhavan]

Related:

• Remove BinaryFormatter uses #1131
• https://github.com/dotnet/corefx/issues/38760

Harden the codebase by removing support for UseLegacyDangerousClipboardDeserializationMode and restrictDeserialization` near https://github.com/dotnet/wpf/search?l=C%23&q=binaryformatter&type=