Surveys - Increase the number of allowed choices for single and multiple choices questions

[marandaneto]

Bug Description

Bug description

Right now it's hardcoded to 6 and people want more.

posthog/frontend/src/scenes/surveys/SurveyEditQuestionRow.tsx

Line 318 in 373d5a4

{((value || []).length < 6 || survey.type != SurveyType.Popover) && (

If using the API, there are no limits, the limit is UI only.

We'd need to be sure that the Surveys pop-up renders well with scrollable content on small screen sizes if many choices (either from the browser or a mobile device).

How to reproduce

Additional context

https://posthog.slack.com/archives/C06UTAJJEHM/p1736437180529589?thread_ts=1736393671.434989&cid=C06UTAJJEHM

Debug info

- [ ] PostHog Cloud, Debug information: [please copy/paste from https://us.posthog.com/settings/project-details#variables or https://eu.posthog.com/settings/project-details#variables]
- [ ] PostHog Hobby self-hosted with `docker compose`, version/commit: [please provide]
- [ ] PostHog self-hosted with Kubernetes (deprecated, see [`Sunsetting Kubernetes support`](https://posthog.com/blog/sunsetting-helm-support-posthog)), version/commit: [please provide]