[Sortable] processDeletion fails if $object is a proxy

[usu]

Objects registered for deletion in the UOW can be non-initalized proxies.

In this case the $position property read in processDeletion returns null:
https://github.com/doctrine-extensions/DoctrineExtensions/blob/main/src/Sortable/SortableListener.php#L518
$position = $meta->getReflectionProperty($config['position'])->getValue($object);

This will create invalid SQL statements in updatePositions.

Should we use EntityWrapper to initialize proxies and load values from entities/proxies?

[github-actions]

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