test-copies: filter out the linkrev part of `debugindex` It is not really useful for the tests and is a large source of churn when adding more revisions to the tests. Differential Revision: https://phab.mercurial-scm.org/D10050

test-copies: use "case-id" instead of revision number when listing sidedata The revision number are not very informative and can change when new changeset are added, creating unnecessary churn. We change the template before adding more test to improve clarify of the over changesets. Differential Revision: https://phab.mercurial-scm.org/D10049