Update metrics in training pipeline to support automatic comparability

the metrics json output should include the section "more_is_better" and "less_is_better":

            "metrics": {
                "date_time": "2024-02-23 08:03:00",
                "type": "regression-metrics/v1",
                "less_is_better": {
                    "mse": 0.0025680503998073007,
                    "rmse": 0.05067593511527242
                },
                "more_is_better": {
                    "r_squared": 0.831178119365146,
                    "adjusted_r_squared": 0.8270170166734419
                },
                "status_text": "success"
            }

please just push the new docker image withe same tag to avoid new onboarding and publication