Rewrite tool.Array.select_only_parent as a thin call to
tool.Blender.select_and_activate_single_object; drop the ad-hoc
per-child deselect loop and the unused parent_element parameter.
Replace the tail parent_obj.select_set(True) in _regenerate_array_body
with tool.Blender.set_object_selection, which wraps select_set in the
hidden-object try/except the utility already owns.
Relates to #8088.
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Gorgious56
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