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Deprecate the ungroupedlist api option

Description

Deprecate the ungroupedlist api option

This is used in the GetClaims and GetEntities api modules.

The current DataModelSerialization library does not
support ungrouped lists currently, do we could deprecate
this now to give people warning.

It would be great to get this into the next branch
to avoid blocking the removal for too long.

Bug: T106863
Change-Id: Ia8e5d549b81d769089646ae1714d5bc08edacf0a