Add custom labels to all imported issues
<!--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=216483) </details> <!--IssueSummary end--> ## Problem to solve When importing issues from another issue tracker, I would like an option to add a set of custom labels, so that I can easily find the issues that were imported. As MVC, we could add just one label (auto-created). ## Proposed solution In order to help users to keep track of what was imported, we can apply an `imported-<timestamp>` label to the newly imported issues. This will give users a good way to identify the imported issues.
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