Add actor to `data_transfer_monitoring` feature flag
<!--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=395671) </details> <!--IssueSummary end--> Follow-up to https://gitlab.com/gitlab-org/gitlab/-/merge_requests/113599#note_1307575006 We should consider adding an actor (group or project) to the `data_transfer_monitoring` feature flag.
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