break links to collection when resource is soft-deleted

@_rpc_groups(["Resources"])

def delete_resource(user: User, resource_id: int) -> bool:

    """

    Permanently delete a resource given its id.

    Permanently (soft) delete a resource given its id.

    """

    query_set: Union[Iterator[Resource], QuerySet] = Resource.objects.filter(

        pk=resource_id, deleted_at__isnull=True

    if not resource_instance:

        return True

    _check_project_permission(user, resource_instance.ptr_project, PERM_RESOURCE_DELETE)

    # break link with current collections

    for current_collection in resource_instance.collections.all():

        remove_resource_from_collection(

            user, resource_instance.pk, current_collection.pk

        )

    resource_instance.soft_delete()

    return True