Install lcov in python container.
This container is used in all the common steps in the cki pipeline.
To install lcov, we're going to use the snippet provided in https://gitlab.com/cki-project/kernel-tests/-/blob/main/kcov/include/include.sh using the hierarchical option to be able to have support to hierarchical on genhtml
Related with https://gitlab.com/cki-project/kpet-db/-/issues/53