CI/CD: Fix coverage reports by removing pytest-cov
For some reason pytest-cov is not merging the .tox//rtctools and src/ paths. Instead we now resort to using coverage directly, which will be forced to merge the paths by the "combine" call.
For some reason pytest-cov is not merging the .tox//rtctools and src/ paths. Instead we now resort to using coverage directly, which will be forced to merge the paths by the "combine" call.