Configure relative/absolute MDE

[jurajmajerik]

Feature request

Is your feature request related to a problem?

We should be able to set whether or not we are defining a Relative or Absolute MDE value. I think it would then make sense to have project wide defaults that we could configure in the settings (that says that the MDE is by default Relative or Absolute).

I believe this would solve the internal issue we are having where our analysts and PMs essentially don’t trust the Statistical Significance declaration and the Sample Size Goal stated.

Describe the solution you'd like

Describe alternatives you've considered

Additional context

Debug info

- [ ] PostHog Cloud, Debug information: [please copy/paste from https://us.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]