feat(ci): enable unit-tests report
Description
CTest will now output unit-tests results in JUnit format in the CI. This will allow us to see the results of the unit-tests in the GitLab web interface. Unfortunately, this doesn't work on the Windows CI right now, as the feature was added in CMake 3.21.0, while the version on our Windows CI is 3.19.08, as such it only silently fails, outputting no file.
Closes #831 (closed)
How to test it?
A fourth tab "Test" should appear. If it's here and its content is coherent with the actual results of the test, it works.