Revokes stored Google login tokens so the app is removed from the user's Google account access list.
Best-effort: silently no-ops when no refresh token is stored; logs decryption/revoke failures.
Parameters
userId: string
Auth user id.
Returns Promise<void>
Resolves when the revoke attempt finishes (including no-op cases).
Revokes stored Google login tokens so the app is removed from the user's Google account access list. Best-effort: silently no-ops when no refresh token is stored; logs decryption/revoke failures.