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
response = self.client.post(
            f"/api/projects/{self.team.id}/insights",
            data={
                "name": "a created dashboard",
                "filters": {
                    "events": [{"id": "$pageview"}],
                    "properties": [{"key": "$browser", "value": "Mac OS X"}],
                    "date_from": "-90d",
                },
            },
        )
        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
        response_data = response.json()
        self.assertEqual(response_data["description"], None)
        self.assertEqual(response_data["tags"], [])
        objects = Insight.objects.all()
        self.assertEqual(len(objects), 1)
        self.assertEqual(objects[0].filters["events"][0]["id"], "$pageview")
        self.assertEqual(objects[0].filters["date_from"], "-90d")
        self.assertEqual(len(objects[0].short_id), 8)
        self.assert_insight_activity(
            response_data["id"],
            [
                {