release-22.1:Backport!6286

Merged Andrey Vertiprahov requested to merge cherry-pick-4717bfce into release-22.1

#1831 (closed) Add iter_related_changed method for getting related model.

See merge request !6286 (merged)

(cherry picked from commit 4717bfce)

5030928d Add iter_related_changed method for getting related model. cac5feb0 Add iter_related_changed to DNSZoneRecord. f8ee2e9e Fix operation. 0c7769e8 Use get_changed_instance method. 91b593fc Cleanup iter_related_changed.

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