supabase / supabase / 29025796685 / 1 – studio-tests

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feat(studio): add sign in with ChatGPT (#47772)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Feature

## Summary
Introduce a "Sign in with ChatGPT" option gated by the new
`dashboard_auth:sign_in_with_chatgpt` feature flag and a manual
localStorage rollout switch (`SIGN_IN_CHATGPT_ENABLED`), since the
feature is still WIP.

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

## Summary by CodeRabbit

* **New Features**
  * Added support for signing in with ChatGPT alongside GitHub.
* ChatGPT sign-in now depends on both a feature flag and an additional
rollout setting.
* Updated provider availability so the app can show the correct sign-in
options.

* **Bug Fixes**
* Improved validation and coverage to ensure sign-in options appear only
when fully enabled.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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