HHH-17840 Fix inconsistency of read/write null JsonNode/JsonValue

[quaff]

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After this commit, read stored null JsonNode/JsonValue will return as it is instead of NullNode/JsonValueImpl(null).

https://hibernate.atlassian.net/browse/HHH-17840

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[quaff]

ping

[beikov]

Thanks for the work. I figured there were some nullability issues and did a proper fix in https://github.com/hibernate/hibernate-orm/pull/8638