Item Operations: Fixes JsonSerialization exception when MissingMemberHandling = Error on Json default settings when NotFound on Item operations.#4125

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4115-cosmos-sdk-v3-throws-a-serialization-exception-instead-of-a-notfound-exception-when-jsonconvertdefaultsettingsmissingmemberhandling=errorAzure/azure-cosmos-dotnet-v3:4115-cosmos-sdk-v3-throws-a-serialization-exception-instead-of-a-notfound-exception-when-jsonconvertdefaultsettingsmissingmemberhandling=errorCopy head branch name to clipboard