New API endpoint `import/gitea`
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=442717) </details> <!--IssueSummary end--> Numerous Gitea repositories imports are hardly doable through the web interface, and an api endpoint would be a great improvment. In the process of migrating around 1500 repositories from gitea to gitlab, I patched my own gitlab to make this endpoint work and thus proposing this improvement in !145234 This MR needs specs added to be complete. I open the issue here to smooth the process of reviewing the PR by the team
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