Configuration level to define when to not serialize the Optional property (undefined)

[Nness]

This was achieved in NewtonSoft.Json through DefaultContractResolver. At the time of implementation, System.Text.Json does not have anything equivalent.

People have logged following issue.
dotnet/runtime#31257

Microsoft's potential equivalent, need to test out.
dotnet/runtime#63686

Part of change in:
dotnet/runtime#36785

[Nness]

.net 8 change in coming.
dotnet/runtime#71967

[Nness]

https://github.com/dotnet/runtime/blob/256bf67b969c56f8b3e87c506eb613cce36e778f/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/JsonPropertyInfo.cs