get https://{workspace}.api.vitruvi.cc/api/v1/entity_files/linked_folder/
Returns the list of link folders for a to-many file_relation, putting as the first result a link folder to the source of such relation and then one folder for each model instance which is a target of it. Expects three query parameters:
- content_type_id: id of the content type of the source of the to-many relation
- object_id: id of the model instance of the source of the to-many relation
- link: key of the to-many relation, which will be one of the relations declared in the file_relation property of the CustomMeta inner class of the model which is the source of the to-many relation