Support oauth userid for Dingtalk

What does this MR do and why?

Issue: https://jihulab.com/gitlab-cn/gitlab/-/issues/4690

在之前，在使用钉钉进行 OAuth 登录时，我们取钉钉数据中的 openid 来关联用户。当前 MR 支持按照 userid 关联用户。

Feature flag: ff_dingtalk_oauth_use_userid .

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iShot_2025-02-11_16.29.272