## Is your feature request related to a problem?

We currently load the "time conversion bins" funnel view [in two steps](https://github.com/PostHog/posthog/blob/cfd7e586ac144a0fb6c18f90a1657db9897d033a/frontend/src/scenes/funnels/funnelLogic.ts#L164):

```js
const result = await pollFunnel<FunnelStep[] | FunnelStep[][]>({
    ...apiParams,
    refresh,
    // Time to convert requires steps funnel api to be called for now. Remove once two api's are functionally separated
    funnel_viz_type:
        filters.funnel_viz_type === FunnelVizType.TimeToConvert
            ? FunnelVizType.Steps
            : apiParams.funnel_viz_type,
})

if (filters.funnel_viz_type === FunnelVizType.TimeToConvert) {
    const binsResult = await pollFunnel<FunnelsTimeConversionBins>({
        ...apiParams,
        ...(refresh ? { refresh } : {}),
    })
}
```

## Describe the solution you'd like

I'd like to make just one query. This makes caching dashboard results much easier.


#### *Thank you* for your feature request – we love each and every one!

ee/clickhouse/queries/funnels/test/test_funnel_time_to_convert.py
_create_person(distinct_ids=["user a"], team=self.team)
        _create_person(distinct_ids=["user b"], team=self.team)
        _create_person(distinct_ids=["user c"], team=self.team)
        _create_event(event="step one", distinct_id="user a", team=self.team, timestamp="2021-06-08 18:00:00")
        _create_event(event="step two", distinct_id="user a", team=self.team, timestamp="2021-06-08 19:00:00")
        _create_event(event="step three", distinct_id="user a", team=self.team, timestamp="2021-06-08 21:00:00")
        
        _create_event(event="step one", distinct_id="user b", team=self.team, timestamp="2021-06-09 13:00:00")
        _create_event(event="step two", distinct_id="user b", team=self.team, timestamp="2021-06-09 13:37:00")
        _create_event(event="step one", distinct_id="user c", team=self.team, timestamp="2021-06-11 07:00:00")
        _create_event(event="step two", distinct_id="user c", team=self.team, timestamp="2021-06-12 06:00:00")
        filter = Filter(
            data={
                "insight": INSIGHT_FUNNELS,
                "interval": "day",
                "date_from": "2021-06-07 00:00:00",