[SDK] Raise more human-readable name conflict exception

Co-authored-by: andreafehrman <andrea.k.fehrman@vanderbilt.edu>
Co-authored-by: harrisonfritz <harrisonmichaelfritz@gmail.com>

sdk/python/v1beta1/kubeflow/katib/api/katib_client.py

@@ -105,7 +105,11 @@ def create_experiment(
             raise TimeoutError(
                 f"Timeout to create Katib Experiment: {namespace}/{experiment.metadata.name}"
             )
-        except Exception:
+        except Exception as e:
+            if hasattr(e, "status") and e.status == 409:
+                raise Exception(
+                    f"A Katib Experiment with the name {namespace}/{experiment.metadata.name} already exists."
+                )
             raise RuntimeError(
                 f"Failed to create Katib Experiment: {namespace}/{experiment.metadata.name}"
             )