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Gjør det mulig å hente objekt av type Node for læringssteg.
Denne skulle egentlig løse NDLANO/Issues#4143 men siden vi no alltid henter ressurser som barn av foreldre-emnet så vil ikkje det lenger slå til. Fjerner også parentId og rootId fra resource siden det aldri har blitt tatt i bruk, og blei innført i forbindelse ned nevnt issue.