Add a function to empty originalKeys in ParentEntityRevisionUpdater
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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