GREG-318: Fix endpoints

Changed the endpoint POST /api/v1/sponsors/{sponsor_id}/orgunit/{orgunit_id}. It should now create or update a SponsorOrganizationalUnit and not an OrganizationalUnit.
Made the endpoints
GET /api/v1/sponsors/{sponsor_id}/orgunit/{orgunit_id} which gets a SponsorOrganizationalUnit
and
GET /api/v1/sponsors/{sponsor_id}/orgunits which lists all SponsorOrganizationalUnit connected to the sponsor

changed the description

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• 86ea1b7b - Add new endpont and change existing endpoint

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@Tore.Brede Vil du sjekke om dette påvirker dere? Disse endepunktene har vært dokumentert feil, men oppførselen skal i teorien være helt lik, ut i fra det jeg kan se.

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• f9139ae0 - Move serializer from greg to gregui

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• 1b37d96b - Move serializer from greg to gregui

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approved this merge request

resolved all threads

mentioned in commit 932520f9

merged