Add a function to empty originalKeys in ParentEntityRevisionUpdater
>>> [!note] Migrated issue
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<!-- Migrated from issue #3544742. -->
Reported by: [danielveza](https://www.drupal.org/user/3362504)
Related to !62
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>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.</p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Add new static flushOriginalKeys function to ParentEntityRevisionUpdater</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<h3 id="summary-ui-changes">User interface changes</h3>
<h3 id="summary-api-changes">API changes</h3>
<p>New static flushOriginalKeys function added to ParentEntityRevisionUpdater</p>
<h3 id="summary-data-model-changes">Data model changes</h3>
issue