Gitee import app part (Gitee import 4/4)

What does this MR do and why?

related to issue https://jihulab.com/gitlab-cn/gitlab/-/issues/1523 and https://jihulab.com/gitlab-cn/gitlab/-/issues/1524

Add Gitee import app part.

Screenshots or screen recordings

1. Click New project/repository
2. Click Gitee
3. Insert your personal access token of Gitee and click Authenticate
4. Chose the project you want to import and click Import

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.