Switching accounts results in a 403: Delegation denied error

从账户切换流程和 GIDSignIn.sharedInstance.restorePreviousSignIn 开始，比较注销和登录前后的 token 与会话状态。在 iOS 16.2 上复现 Gmail 请求序列；完成标准是从账户 1 切换到账户 2 后，后续的 Google API 调用使用账户 2，且不需要重启应用。

Describe the bug
I'm running into an odd bug where I can can successfully switch between multiple Google accounts (say from account 1 to account 2), but Gmail (or any other Google service) believes I'm still logged in account 1.

To Reproduce
Steps to reproduce the behavior:

1. Login with Google account 1

2. Observe that the API calls to Gmail are successful

3. Logout and login with Google account 2

4. Observe that the app received a new auth token and account 2's email address

5. Any call to Gmail will now result in a "403: Delegation denied error for <Account 1>"

6. Kill and restart the app

7. The app will restore the previous session without user interaction using GIDSignIn.sharedInstance.restorePreviousSignIn

8. Observe Google account 2's session was restored and now all calls to Gmail are successful

9. Login with Google account 1

10. Observe that the API calls to Gmail are successful

11. Logout and login with Google account 2

12. Observe that the app received a new auth token and account 2's email address

13. Any call to Gmail will now result in a "403: Delegation denied error for <Account 1>"

14. Logout and login with Google account 1

15. Observe that the app received a new auth token and account 1's email address

16. Calls to Gmail for account 1 are successful

Expected behavior
I expect to be able to log out and log in with a different account successfully

Screenshots
None.

Environment

• Device: Simulator and iPhone 12
• OS: iOS 16.2
• Browser: Swift app

Additional context
Add any other context about the problem here.