SIENTIAPDE-1249: Refactor TrainModelParams to use dataclass and add from_dict method for validation, remove no-cache-dir from pip install in quality gate workflow, and rename X_train/X_test to x_train/x_test in TrainModelResult.

.github/workflows/quality-gate.yml

@@ -208,8 +208,8 @@ jobs:
       - name: 📦 Install Dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install --no-cache-dir -r ${{ steps.prepare-requirements.outputs.PROCESSED_REQUIREMENTS_FILE }}
-          pip install --no-cache-dir -r requirements-dev.txt
+          pip install -r ${{ steps.prepare-requirements.outputs.PROCESSED_REQUIREMENTS_FILE }}
+          pip install -r requirements-dev.txt
 
       - name: 📝 Code Formatting Check (Ruff)
         run: |