Preserve entity changed timestamp during og_entity_membership migration
>>> [!note] Migrated issue
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<!-- Migrated from issue #3543021. -->
Reported by: [joelpittet](https://www.drupal.org/user/160302)
Related to !2
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Currently, migrating og_entity_membership updates the group content entity’s changed time to the migration run time, since the entity is saved directly. </p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>This MR marks the entity as syncing before save, ensuring the original changed timestamp is preserved and not bumped during migration.</p>
issue