supabase / auth / 9487577036

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feat: add support for Slack OAuth V2 (#1591)

## What kind of change does this PR introduce?

- Updates the Slack OAuth provider with the new Sign In With Slack V2.
- Creates a test for Slack, improving test coverage
- Moves the old Slack provider to slack_legacy. Some users might still
rely on this provider after the creation of legacy apps is disallowed on
June 4th.

## What is the current behavior?

Fixes #1294

Current behavior uses the original Slack OAuth V1 which is sunsetting
June 4th according to [the
changelog](https://api.slack.com/changelog/2024-04-discontinuing-new-creation-of-classic-slack-apps-and-custom-bots)

## What is the new behavior?

New behavior now leverages the new [Sign In With
Slack](https://api.slack.com/authentication/sign-in-with-slack) (SIWS)
on OAuth V2 for Slack authentication.

## Additional context

A ticket should be created for ending support on slack_legacy.

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Co-authored-by: Kang Ming <kang.ming1996@gmail.com>

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