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
limit = int(request.query_params.get("limit", "10"))
        page = int(request.query_params.get("page", "1"))
        item_id = kwargs["pk"]
        if not Insight.objects.filter(id=item_id, team_id=self.team_id).exists():
            return Response("", status=status.HTTP_404_NOT_FOUND)
        activity_page = load_activity(scope="Insight", team_id=self.team_id, item_id=item_id, limit=limit, page=page)
        return self._return_activity_page(activity_page, limit, page, request)
    @staticmethod
    def _return_activity_page(activity_page: ActivityPage, limit: int, page: int, request: request.Request) -> Response:
        return Response(
            {
                "results": ActivityLogSerializer(activity_page.results, many=True,).data,
                "next": format_query_params_absolute_url(request, page + 1, limit, offset_alias="page")
                if activity_page.has_next
                else None,
                "previous": format_query_params_absolute_url(request, page - 1, limit, offset_alias="page")
                if activity_page.has_previous
                else None,
                "total_count": activity_page.total_count,
            },
            status=status.HTTP_200_OK,
        )
class LegacyInsightViewSet(InsightViewSet):
    legacy_team_compatibility = True