Fix to #34960 - System.Text.Json.JsonReaderException: '0x00' is invalid after a single JSON value. Expected end of data #34969
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When entity or collection of entities is mapped to JSON null value for that object can be represented either as relational null, or as JSON with null value inside 'null'. Problem was that IncludeJsonEntityReference and IncludeJsonEntityCollection were only checking for null value, and not for the JSON 'null'. (MaterializeJsonEntity and MaterializeJsonEntityCollection had the logic for both)
Fix is to add the missing logic so that upon encountering Null token we just return, rather than run shaper code for the entity. Also added some validation that throws if StartObject is not the first token (again, copying logic from MaterializeJsonEntity method)
Fixes #34960