Had the "pleasure" of finding a mocker.patch leak into other tests and one
of the suspicions is that mixing unittest.mock and mocker might be somehow
related.
In any case, we should use mocker where possible anyway.
Followed from #7592
1. Seperate remove method to a new file.
2. Add queued, failed, processed flags to remove.
3. Add new unit tests for queue status --queue/fail/success
4. Implement methods to remove done tasks.
5. add some new unit and functional test for celery_queue.remove
6. bump into dvc-task version 0.0.13
Ruslan Kuprieiev
skshetry
karajan1001