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
filter_dict = {
            "events": [{"id": "$pageview"}],
        }
        insight_1 = Insight.objects.create(
            filters=Filter(data=filter_dict).to_dict(), team=self.team, short_id="12345678",
        )
        insight_2 = Insight.objects.create(
            filters=Filter(data=filter_dict).to_dict(), team=self.team, short_id="98765432",
        )
        self.client.post(f"/api/projects/{self.team.id}/insights/{insight_1.id}/viewed")
        self.client.post(f"/api/projects/{self.team.id}/insights/{insight_2.id}/viewed")
        response = self.client.get(
            f"/api/projects/{self.team.id}/insights/?my_last_viewed=true&order=-my_last_viewed_at"
        )
        response_data = response.json()
        
        self.assertEqual(response.status_code, status.HTTP_200_OK)