The original name `retrieve_widgets()` was unclear as it suggested it was a getter, i.e. getting the widgets. This function does more than get: finds orphaned widgets, assigns them to the inactive sidebar, and updates the database.
The new name is `sync_registered_widgets()` which better represents what happens when this function is invoked.
The original `retrieve_widgets()` function is soft deprecated to avoid unnecessary code churn downstream for developers that support more than the latest version of WordPress.
Follow-up to [18630].
Props zieladam, timothyblynjacobs, andraganescu, hellofromTonya.
See #53811.
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