topic: extend topic gating to descendant
If a changeset with topic as descendant without topic, we need to exclude them
too when using: topic.server-gate-topic-changesets.
This is the actual check list for releasing evolve version X.Y.Z
More details in the [README file](README#L179).
Preparation
* [ ] merges with compatibility branches
* [ ] compatibility tests are happy
* [ ] update `testedwith` field
* [ ] make sure the changelog is up to data
* [ ] [prepare an announcement for the list/website](https://mypads.framapad.org/mypads/?/mypads/group/octobus-public-5d3rw470w/pad/view/evolution-announce-iswcp7qx)
* [ ] sanity check install and sdist targets of setup.py
Releasing
* [ ] add the current date to the changelog
* [ ] update the `__version__` field of all relevant extensions
* [ ] create a new Debian entry
* [ ] tag the version
* [ ] move the `@` bookmark on the new tag
* [ ] push/publish the tag to the main repository
* [ ] upload the tarball to PyPI
* [ ] add `.dev` to the `__version__` field
* [ ] merge stable into default
* [ ] push the result on the main repo
* [ ] send the announcement by email to evolve-testers@mercurial-scm.org
* [ ] send the announcement by email to mercurial@mercurial-scm.org
* [ ] publish the announcement as a blog on https://octobus.net/blog/
* [ ] tweet about it