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/insight.py
"description",
            "updated_at",
            "tags",
            "favorited",
            "saved",
            "last_modified_at",
            "last_modified_by",
            "is_sample",
            "effective_restriction_level",
            "effective_privilege_level",
        ]
        read_only_fields = (
            "created_at",
            "created_by",
            "last_modified_at",
            "last_modified_by",
            "short_id",
            "updated_at",
            "is_sample",
            "effective_restriction_level",
            "effective_privilege_level",
            "refreshing",
        )
    @lru_cache(maxsize=1)  
    def dashboard_tile_from_context(self, insight: Insight, dashboard: Optional[Dashboard]) -> Optional[DashboardTile]:
        dashboard_tile: Optional[DashboardTile] = None
        if dashboard:
            dashboard_tile = DashboardTile.objects.filter(insight=insight, dashboard=dashboard).first()
        return dashboard_tile
    def create(self, validated_data: Dict, *args: Any, **kwargs: Any) -> Insight: