SIENTIAPDE-1646

Enhance MLFlow run ID resolution with error handling for missing and invalid source URIs

- Added checks in `get_model_run_id` method to raise exceptions for models with missing or invalid source URIs.
- Introduced new test cases to validate error handling for these scenarios.
- Updated `requirements-light.txt` to include `mlflow` as a dependency.

laborious/utils/repository/model_repository.py

@@ -170,8 +170,19 @@ class MLFlowRepository(SientiaMonitoring):
 
         # Sort by version number to get the latest
         latest_version = max(stage_versions, key=lambda v: int(v.version))
-        run_id = latest_version.source.split('/')
-        return run_id[2]
+        source = latest_version.source
+        if source is None:
+            raise mlflow.exceptions.MlflowException(
+                f"Model '{model_name}' version '{latest_version.version}' in stage '{stage}' "
+                'has no source URI to resolve run ID.'
+            )
+        parts = source.split('/')
+        if len(parts) <= 2 or not parts[2]:
+            raise mlflow.exceptions.MlflowException(
+                f"Model '{model_name}' version '{latest_version.version}' in stage '{stage}' "
+                f"has invalid source URI '{source}' for run ID resolution."
+            )
+        return parts[2]
 
     def get_next_run_name(self, model_name: str) -> str:
         """