Add a function to empty originalKeys in ParentEntityRevisionUpdater

Issue information

From user: danielveza

Related to !62 (merged)

Contribution record

Fork management

Problem/Motivation

We have additional logic on one of our sites for the ordering and moving of children, and this is interferring. Lets add a way to flush the originalKeys property.

Steps to reproduce

Proposed resolution

Add new static flushOriginalKeys function to ParentEntityRevisionUpdater

Remaining tasks

User interface changes

API changes

New static flushOriginalKeys function added to ParentEntityRevisionUpdater

Data model changes

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