<!--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=508916) </details> <!--IssueSummary end--> The `::ImportUsersWorker` was `no-op`ed in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/174880 as the new User Contribution Mapping feature renders it unnecessary. We should now remove the class completely. <!-- template sourced from https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/issue_templates/Default.md -->