configure objectmapper to stop ignoreing null field

There's a discussion that mentioning AWS is not including the null fields in the query result: https://opensdu.slack.com/archives/C01C2Q4G9BK/p1733973219213619 However, the root cause is the Objectmapper in the RestClientTransport is ignoring all null fields, which is in the core code.

changed milestone to %M24 - Release 0.27

added AWS Common Code MRBugfix labels

assigned to @jtyself

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mentioned in commit ce1d213c