SIENTIAPDE-1171

SIENTIAPDE-1171 feat: add minimal retrain schedule configuration to samples.json and update formatters.py

- Added a new schedule configuration for the minimal retrain pipeline in samples.json.
- Updated the Formatters class in formatters.py to handle the new minimal retrain workflow type, integrating the minimal_retrain function for streamlined processing.

samples.json

@@ -120,7 +120,17 @@
             ],
             "active": true,
             "updated_at": "2025-07-14 10:00:00.000000"
-          }
+          },
+        "3": {
+            "schedule_name": "minimal-retrain-pipeline",
+            "model_id": "1",
+            "workflow_type": "minimal_retrain",
+            "frequency": "5m",
+            "max_retry_policy": 1,
+            "query": "select * from sientia_data.laborious_data order by \"timestamp\" desc limit 30;",
+            "active": true,
+            "updated_at": "2025-07-23 10:00:00.000000"
+        }
     },
     "opc-servers": {
         "1": {