supabase / supabase / 29713749380

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Add support for multiple custom auth providers in custom-content (#48030)

## Context

Adds support for multiple custom auth providers in custom-content

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

* **New Features**
* Added support for multiple custom sign-in providers via a new plural
configuration.
* Updated the sign-in page to render all configured custom provider
options while maintaining compatibility with the legacy single-provider
setting.
* Improved the custom provider button display to remove internal
prefixes from provider names.

* **Documentation**
* Updated the configuration schema, examples, and sample data to
document the new multi-provider setting.
* Marked the legacy single-provider configuration as deprecated in favor
of the plural option.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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