Remove zentao/ones integrations duplicated link in super sidebar

What does this MR do and why?

Related issue: https://jihulab.com/gitlab-cn/gitlab/-/issues/3326

Remove zentao/ones integrations duplicated link in super sidebar

In the screenshot below, the third link is as same as the second, and the third is generated by upstream external integration link.

So after discussed with PM(https://jihulab.com/gitlab-cn/gitlab/-/issues/3326#note_3526261), we can remove the third to avoid the duplication.

And this MR also fix this bug:

https://jihulab.com/gitlab-cn/gitlab/-/issues/3326#note_2876859

Screenshots or screen recordings

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