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
#
    
    
    
    
    #
    
    
    
    
    
    @extend_schema(
        request=TrendSerializer,
        methods=["POST"],
        tags=["trend"],
        operation_id="Trends",
        responses=TrendResultsSerializer,
    )
    @action(methods=["GET", "POST"], detail=False)
    def trend(self, request: request.Request, *args: Any, **kwargs: Any):
        try:
            serializer = TrendSerializer(request=request)
            serializer.is_valid(raise_exception=True)
        except Exception as e:
            capture_exception(e)
        result = self.calculate_trends(request)