Add sync-indexing options on nuxeo-operation-button

Users report a refresh issue in the Web UI when an automation chain/scripting, which moves child document(s) to another folder, is called when viewing a folder.

It has been fixed by ELEMENTS-546 to force synchronous udpate of the ES index.

EDIT root issue here is the missing sync-indexing option on nuxeo-operation-button that should forward it to the inner nuxeo-operation element.

But on 9.10, we did not have such option, it was done by specifying the headers like in https://github.com/nuxeo/nuxeo-web-ui/blob/9.10/elements/nuxeo-document-bulk-actions/nuxeo-delete-documents-button.html#L44

headers='{"nx_es_sync": "true"}'