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/test/test_insight.py
dashboard_id, _ = self._create_dashboard({"filters": {"date_from": "-14d",}})
        with freeze_time("2012-01-14T03:21:34.000Z"):
            _create_event(team=self.team, event="$pageview", distinct_id="1")
            _create_event(team=self.team, event="$pageview", distinct_id="2")
        with freeze_time("2012-01-15T04:01:34.000Z"):
            response = self.client.post(
                f"/api/projects/{self.team.id}/insights",
                data={"filters": {"events": [{"id": "$pageview"}]}, "dashboards": [dashboard_id]},
            ).json()
            self.assertEqual(response["last_refresh"], None)
            response = self.client.get(f"/api/projects/{self.team.id}/insights/{response['id']}/?refresh=true").json()
            self.assertEqual(spy_update_insight_cache.call_count, 1)
            self.assertEqual(response["result"][0]["data"], [0, 0, 0, 0, 0, 0, 2, 0])
            self.assertEqual(response["last_refresh"], "2012-01-15T04:01:34Z")
            self.assertEqual(response["last_modified_at"], "2012-01-15T04:01:34Z")
        with freeze_time("2012-01-15T05:01:34.000Z"):
            _create_event(team=self.team, event="$pageview", distinct_id="1")
            response = self.client.get(f"/api/projects/{self.team.id}/insights/{response['id']}/?refresh=true").json()
            self.assertEqual(spy_update_insight_cache.call_count, 2)
            self.assertEqual(response["result"][0]["data"], [0, 0, 0, 0, 0, 0, 2, 1])
            self.assertEqual(response["last_refresh"], "2012-01-15T05:01:34Z")