[linker] Remove C#8 Nullable attributes #4056
Merged
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Implements #3911
Context: https://github.com/dotnet/roslyn/blob/7bc44488c661fd6bbb6c53f39512a6fe0cc5ef84/docs/features/nullable-metadata.md
C#8 non-null reference uses custom attributes to let compiler know
more information related to non-null reference.
These shouldn't be needed when running on device, as the C# language
feature doesn't require modifications to the runtime. Thus it should
be safe to remove them.