Add a config option to allow using entity reference field

Just a heads up: this patch no longer applies (D10.2.2). I removed the conflict locally and I *think* the stuff this fixed is still working but I'm not super familiar with it so don't trust that. Perhaps the issue has been fixed elsewhere?

Yes, this was changed by 📌 Change paragraphs_form_field_storage_config_edit_form_alter() to only discourage paragraph target references, not disallow Fixed , due to Drupal 10.2 changes.