Try calculating code coverage normally (per-package) as it had been done before #1194
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Otherwise, the coverage of a package depends on tests in other packages which can lead to situations where modifying a test or code of one package leads to having to add tests in other packages. Also, computing the code coverage for the whole project as a monolith contradicts the idea of the packages as separate libraries.
Also, there is a technical decision made in March 2019 stating the code coverage should be computed per-package (https://github.com/France-ioi/algorea-devdoc/pull/60/files#diff-36f14a930e1574edebba78bb847f62fb08ae10745ffe74ae65deed384d213285R71).