[Task] CI: Replace semantic release by convco

[taorepoara]

What should be done

Since semantic release does not manage multiple pre-release channels (semantic-release/semantic-release#2416), replace it by a simpler tool: convco.

Technical recommandation

Define the allowed channels (branches) in a file.
Use convco to generate the release note and define the next version.
Use the built-in GitHub API to create the releases.

[taorepoara]

Convco does not seem to be ready yet. I've tried to use it on two projects and it gave me bad next versions. I'll use the semantic release fix instead.