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
from rest_framework.response import Response
from rest_framework.settings import api_settings
from rest_framework_csv import renderers as csvrenderers
from sentry_sdk import capture_exception
from ee.clickhouse.queries.funnels import ClickhouseFunnelTimeToConvert, ClickhouseFunnelTrends
from ee.clickhouse.queries.funnels.utils import get_funnel_order_class
from ee.clickhouse.queries.paths.paths import ClickhousePaths
from ee.clickhouse.queries.retention.clickhouse_retention import ClickhouseRetention
from ee.clickhouse.queries.stickiness.clickhouse_stickiness import ClickhouseStickiness
from ee.clickhouse.queries.trends.clickhouse_trends import ClickhouseTrends
from posthog.api.documentation import extend_schema
from posthog.api.insight_serializers import (
    FunnelSerializer,
    FunnelStepsResultsSerializer,
    TrendResultsSerializer,
    TrendSerializer,
)
from posthog.api.routing import StructuredViewSetMixin
from posthog.api.shared import UserBasicSerializer
from posthog.api.tagged_item import TaggedItemSerializerMixin, TaggedItemViewSetMixin
from posthog.api.utils import format_paginated_url
from posthog.constants import (
    BREAKDOWN_VALUES_LIMIT,
    INSIGHT,
    INSIGHT_FUNNELS,
    INSIGHT_PATHS,
    INSIGHT_STICKINESS,
    PATHS_INCLUDE_EVENT_TYPES,
    TRENDS_STICKINESS,
    FunnelVizType,