Remove ProjectDailyStatisticsWorker (and queue)
<!--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=214585) </details> <!--IssueSummary end--> That's a follow from https://gitlab.com/gitlab-com/gl-infra/scalability/-/issues/256, here we'll need to: 1. Remove the feature flag that makes it enqueue jobs to this worker 2. Consider either migrating existing jobs in the queue and process them, or just removing the queue in a major release (a few jobs can be missed in the latter) 3. Remove `ProjectDailyStatisticsWorker` and queue
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