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
maxDiff = None
    CLASS_DATA_LEVEL_SETUP = False
    def test_get_insight_items(self):
        filter_dict = {
            "events": [{"id": "$pageview"}],
            "properties": [{"key": "$browser", "value": "Mac OS X"}],
        }
        Insight.objects.create(filters=Filter(data=filter_dict).to_dict(), team=self.team, created_by=self.user)
        
        Insight.objects.create(filters=Filter(data=filter_dict).to_dict(), team=self.team)
        response = self.client.get(f"/api/projects/{self.team.id}/insights/", data={"user": "true"}).json()
        self.assertEqual(len(response["results"]), 1)
    def test_created_updated_and_last_modified(self):