Add "Launch Survey" Banner to the Survey Draft page

[dmarticus]

Feature request

Juraj suggested that we add a banner that says something like "responses won't be collected until you launch your survey" or "start collecting responses today!" Apparently product analytics has something like that.

Current state

Right now, this is what a pre-launched survey looks like

Additional context

Looking for the easy improvements from Juraj and I's pairing session? Check them out here: https://github.com/PostHog/posthog/issues/22283

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]