chore: update api key to token

[sarahxsanders]

the wizard + in-app onboarding clash with API key vs. project token (correct name) still and this fixes it :) just changing all env vars to the canonical name

related pr: PostHog/posthog#51917

[github-actions]

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[daniloc]

oh fml look at all the ways we'd baked this into our view of the world

gtg for now and I wonder if there's a way we can have a more centralized definition of these things. Maybe it won't matter again but my skin crawls at how duplicative this bit is.