Fix divergent branches of cubicweb jsonschema
We have a series of problem on this cube.
Branches aren't used properly:
- the default branch isn't used
- the branch 0.1 is used by a collection of old CW projects
- the branch 0.2 is used by the big logilab project ™
- 0.1 and 0.2 have diverged /a lot/
All CI pipelines are broken for everyone of the 3 branches: default, 0.1 and 0.2
We should merge all the 3 branches and fix the CI.
Or split the project in 2 different projects.
The more time pass the harder this task is going to be and it's already not trivial at all, see https://forge.extranet.logilab.fr/cubicweb/cubes/jsonschema/-/compare/branch%2F0.1...branch%2F0.2