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
_, _, user2 = User.objects.bootstrap("Test", "team2@posthog.com", None)
        assert user2.team is not None
        assert self.team is not None
        assert self.user.team is not None
        self.assertNotEqual(user2.team.id, self.team.id)
        self.client.force_login(self.user)
        _create_person(team=self.team, distinct_ids=["person1"], properties={"email": "person1@test.com"})
        _create_event(
            team=self.team, event="$pageview", distinct_id="person1", timestamp=timezone.now() - timedelta(days=6),
        )
        _create_event(
            team=self.team, event="$pageview", distinct_id="person1", timestamp=timezone.now() - timedelta(days=5),
        )
        events_filter = json.dumps([{"id": "$pageview"}])
        response_team1 = self.client.get(f"/api/projects/{self.team.id}/insights/trend/?events={events_filter}")
        response_team1_token = self.client.get(
            f"/api/projects/{self.team.id}/insights/trend/?events={events_filter}&token={self.user.team.api_token}"
        )
        self.client.force_login(user2)
        response_team2 = self.client.get(
            f"/api/projects/{self.team.id}/insights/trend/?events={events_filter}",
            data={"token": user2.team.api_token},
        )
        self.assertEqual(response_team1.status_code, 200)
        self.assertEqual(response_team2.status_code, 200)
        self.assertEqual(response_team1.json()["result"], response_team1_token.json()["result"])
        self.assertNotEqual(len(response_team1.json()["result"]), len(response_team2.json()["result"]))
        response_invalid_token = self.client.get(f"/api/projects/{self.team.id}/insights/trend?token=invalid")
        self.assertEqual(response_invalid_token.status_code, 401)
    def test_insight_trends_csv(self):