Add credential scope update

[herber]

Note

Medium Risk
Extends update payloads to include OAuth client_secret and scopes, which are security-sensitive fields; incorrect usage could overwrite credentials or send unintended values.

Overview
Enables updating provider auth credentials’ OAuth fields by extending the generated update methods to accept client_id, client_secret, and scopes, and serializing them into the PATCH request body.

Updates the corresponding generated *AuthCredentialsUpdateBody dataclasses/mappers (for both mt_2025_01_01_dashboard and mt_2026_01_01_magnetar) to include these new fields (with scopes defaulting to an empty list when deserializing).

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