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
"scope": "Insight",
                        "item_id": str(insight_id),
                        "detail": {
                            "changes": [
                                {
                                    "type": "Insight",
                                    "action": "changed",
                                    "field": "name",
                                    "before": "insight name",
                                    "after": "insight new name",
                                },
                            ],
                            "merge": None,
                            "name": "insight new name",
                            "short_id": short_id,
                        },
                    },
                    {
                        "user": {"first_name": "", "email": "user1@posthog.com"},
                        "activity": "created",
                        "created_at": "2012-01-14T03:21:34Z",
                        "scope": "Insight",
                        "item_id": str(insight_id),
                        "detail": {"changes": None, "merge": None, "name": "insight name", "short_id": short_id},
                    },
                ],
            )
    def test_hard_delete_insight(self):
        with freeze_time("2012-01-14T03:21:34.000Z") as frozen_time:
            insight_id, insight = self._create_insight(