Remove excess mlflow params (#169)

* Remove ‘metadata.dataset.variables_metadata’ from parms to log

src/anemoi/training/diagnostics/mlflow/logger.py

@@ -501,7 +501,16 @@ def _clean_params(params: dict[str, Any]) -> dict[str, Any]:
         dict[str, Any]
             Cleaned up params ready for MlFlow.
         """
-        prefixes_to_remove = ["hardware", "data", "dataloader", "model", "training", "diagnostics", "metadata.config"]
+        prefixes_to_remove = [
+            "hardware",
+            "data",
+            "dataloader",
+            "model",
+            "training",
+            "diagnostics",
+            "metadata.config",
+            "metadata.dataset.variables_metadata",
+        ]
         keys_to_remove = [key for key in params if any(key.startswith(prefix) for prefix in prefixes_to_remove)]
         for key in keys_to_remove:
             del params[key]