DEB-1823 migrate publication list description to page section blocks.

EULER2 MIGRATION:

1. new empty section for list
UPDATE publication_list SET data=json_set(data,'$.sections',json('[{sectionType: generic, data: { title: Beskrivelse }, blocks: [{ blockType: text, data: {text:  }, order: 0 } ], order: 0 }]')) ;

2. move description
UPDATE publication_list SET data=json_set(data,'$.sections[0].blocks[0].data.text',json_extract(data,'$.description')) ;

3. delete old descripion
UPDATE publication_list SET data=json_remove(data,'$.description') ;