#59: Implemented a mechanism to read the environment info from the test container

[tomuben]

fixes #59

Also simplified execution of CI builds: Removed unnecessary wrapper scripts for Poetry (Poetry is now already installed by the exasol-toolbox GH action)
It turned out that the wrapper scripts always used Python3.10 for execution, even when the Matrix build was running Python3.11 and Python3.12. Python3.12 has too many issues for now (packages asyncore, smptd and possible others were removed). So the supported for Python3.12 was dropped for now.

A more generic approach was used to provide the reading of the environment info. As the /environment_info.json is responsibility of the integration_test_docker_environment, which however is not a dependency to this project, a simple converter class was provided which reads a json file and converts it to an object with the JSON keys as attributes of the object.
It was decided to not use (munch in order to reduce dependencies.
It's then the client responsibility to call the new method utils.obj_from_json_file('/environment_info.json')

All Submissions:

• Is the title of the Pull Request correct?
• Is the title of the corresponding issue correct?
• Have you updated the changelog?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Are you mentioning the issue which this PullRequest fixes ("Fixes...")