supabase / supabase / 26157181266

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chore(studio): remove HeaderUpgradeButton experiment code (#46144)

## Summary

- Removes the `HeaderUpgradeButton` component, all call sites, and the
`HeaderUpgradeCtaClickedEvent` telemetry type. The GROWTH-615 header
upgrade CTA experiment ended on Apr 29.
- Fixes the `Flag key "headerUpgradeCta" does not exist in PostHog flag
store` console errors that were logging on every render. PostHog drops
disabled flags from `/feature-flags` responses, so the still-mounted
consumer logged a missing-flag warning continuously. Removing the
consumer lets the flag be safely disabled again.

Context: [Slack
thread](https://supabase.slack.com/archives/C07P3AU3J2D/p1779250648219089?thread_ts=1779166940.445709&cid=C07P3AU3J2D)

## Test plan

- [x] `pnpm dev:studio`, open the dashboard, confirm no
`headerUpgradeCta` warning in the browser console
- [x] Desktop header still renders correctly (the button was hidden
behind the `test` variant; visually nothing changes for users since
rollout was 100/0 control)
- [x] Mobile nav bar still renders with `UserDropdown` to the right of
the org/project selector

<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

* **Chores**
* Removed the upgrade call-to-action button from the navigation header
in both desktop and mobile layouts.

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