supabase / supabase / 30342722536

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feat(studio): move SIWC rollout gate to ConfigCat (#48360)

## 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?

Replace the deploy-gated `dashboard_auth:sign_in_with_chatgpt` AND-gate
with useFlag('ShowSignInWithChatGptButton') OR'd against the existing
localStorage opt-in switch, so rollout/rollback no longer requires a
frontend deploy. Remove the now-dead static flag, its only consumer was
this gate.

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

## Summary by CodeRabbit

* **New Features**
* ChatGPT sign-in availability now responds to either the local opt-in
setting or the updated configuration flag.
  * GitHub sign-in continues to follow its dedicated feature setting.

* **Bug Fixes**
* Corrected identity provider visibility across different sign-in
configuration combinations.

* **Chores**
  * Removed the obsolete ChatGPT sign-in feature setting.

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

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