Clear credentials state and delete keychain on SignOut request (#10558)

Release Notes:

- Fixed ([#4716](https://github.com/zed-industries/zed/issues/4716)).

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Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
c81eb419d4Pedro Augusto da Silva Soares committed on 4/17/2024, 1:57:38 AM· committed by GitHubparentc4e446f
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