Get rid of Conda to check incompatibility with a different major version of khiops

[tramora]

Description

Currently, in order to check incompatibility with a different major version of khiops,
the Khiops core Conda package is installed in a dedicated Conda environment in the docker files (for debian, ubuntu and rocky)

Snippet :

    # Install Khiops from a different major version in a dedicated conda environment \
    # for a specific test regarding compatibility test \
    # The python interpreter version of the base environment is used as no specific version is given \
    $CONDA create -y -n py3_khiops10_conda; \
    $CONDA install -y -n py3_khiops10_conda khiops::khiops-core==10.3.1;

Later in the github workflow tests.yml at the step Test Khiops Integration this Conda environment is used to detect the major version mismatch.

Questions/Ideas

For this specific purpose an official but older khiops docker image from docker hub could be used (khiopsml/khiops-ubuntu:10.3.2.1).

A new job using this image would be created in the github workflow tests.yml

[popescu-v]

IMHO, this would be obsoleted by #572 . Hence, also the related integration tests and the ad-hoc Khiops 10 Conda environment in the dev Docker files should be removed.