Expose related marketplace offering in all resource serializers.
Expose related marketplace offering in all resource serializers.

It is needed in order to render breadcrumbs.

opennode/waldur-mastermind,opennode/nodeconductor-assembly-waldur,opennode/nodeconductor-assembly-waldur,opennode/waldur-mastermind,opennode/waldur-mastermind,opennode/waldur-mastermind,opennode/nodeconductor-assembly-waldur