Remove dingtalk oauth
What does this MR do and why?
remove dingtalk oauth in upstream, relate #390855
JH mr: https://jihulab.com/gitlab-cn/gitlab/-/merge_requests/2375
I have two questions
- I am not sure when this mr merged, because in issue it is saying `remove in 17.0`.
- I am not sure whether I should remove the deprecation doc introduced in !112565 (merged)
Edited by MAO Chao