Further improvements of group imports history API
<!--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=341867) </details> <!--IssueSummary end--> This is issue for furthre improvements of group imports history API * ATM, backend for retrieving bulk imports history provides items in chronological order - first item is ~~oldest~~ latest import. ~~This is counter-intuitive to user expectations, so we need either flip an order (simplest solution) or add ~backend parameter for controlling order~~ ![Screenshot-20210928215505-1109x501](/uploads/c64061be9be938464b42c1a018f8497b/Screenshot-20210928215505-1109x501.png) * Filtering by source groups is missing * Author name is missing from API * ~~Original import host is missing from API response, so we're unable to render link to original group on remote instance~~ - `source_type` is available in [migration details endpoint](https://docs.gitlab.com/ee/api/bulk_imports.html#get-group-or-project-migration-details).
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