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
"""
        Various regression tests for the serializer
        """
        
        response = self.client.get(
            f"/api/projects/{self.team.id}/insights/trend/?events={json.dumps([{'id': '$pageview'}])}&properties=%5B%5D&display=ActionsLineGraph"
        )
        self.assertEqual(patch_capture_exception.call_count, 0, patch_capture_exception.call_args_list)
        
        events = [{"id": "$pageview", "properties": [{"key": "something", "value": ["something"]}]}]
        response = self.client.get(
            f"/api/projects/{self.team.id}/insights/trend/?events={json.dumps(events)}&properties=%5B%5D&display=ActionsLineGraph"
        )
        self.assertEqual(patch_capture_exception.call_count, 0, patch_capture_exception.call_args_list)
        
        cohort_one_id = self._create_one_person_cohort([{"key": "prop", "value": 5, "type": "person"}])
        cohort_two_id = self._create_one_person_cohort([{"key": "prop", "value": 6, "type": "person"}])
        events = [
            {"id": "$pageview", "properties": [{"key": "something", "value": ["something"]}]},
            {"id": "$pageview"},
        ]
        response = self.client.post(
            f"/api/projects/{self.team.id}/insights/funnel/",
            {"events": events, "breakdown": [cohort_one_id, cohort_two_id], "breakdown_type": "cohort"},
        )
        self.assertEqual(response.status_code, 200)
        self.assertEqual(patch_capture_exception.call_count, 0, patch_capture_exception.call_args_list)
    def _create_one_person_cohort(self, properties: List[Dict[str, Any]]) -> int: