When exporting data from [an insight](https://app.posthog.com/insights/oVHjTLUD), the action names weren't exported, making the CSV a little hard to follow.

As a user, I'd expect to see the same data in the export as I see in the table in-app.

<img width="1012" alt="image" src="https://user-images.githubusercontent.com/154479/166958828-9b3add76-633b-4f1d-ad2b-cf1ea2888b95.png">

posthog/api/insight.py
filters = request.GET.dict()
        for key in filters:
            if key == "saved":
                if str_to_bool(request.GET["saved"]):
                    queryset = queryset.annotate(dashboards_count=Count("dashboards"))
                    queryset = queryset.filter(Q(saved=True) | Q(dashboards_count__gte=1))
                else:
                    queryset = queryset.filter(Q(saved=False))
            elif key == "my_last_viewed":
                if str_to_bool(request.GET["my_last_viewed"]):
                    queryset = self._annotate_with_my_last_viewed_at(queryset).filter(my_last_viewed_at__isnull=False)
            elif key == "user":
                queryset = queryset.filter(created_by=request.user)
            elif key == "favorited":
                queryset = queryset.filter(Q(favorited=True))
            elif key == "date_from":
                queryset = queryset.filter(last_modified_at__gt=relative_date_parse(request.GET["date_from"]))
            elif key == "date_to":
                queryset = queryset.filter(last_modified_at__lt=relative_date_parse(request.GET["date_to"]))
            elif key == INSIGHT:
                queryset = queryset.filter(filters__insight=request.GET[INSIGHT])
            elif key == "search":
                queryset = queryset.filter(
                    Q(name__icontains=request.GET["search"]) | Q(derived_name__icontains=request.GET["search"])
                )
        return queryset
    def retrieve(self, request, *args, **kwargs):