Add missing license header in test files

tests/test_finetuning.py

@@ -1,3 +1,6 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# This software may be used and distributed according to the terms of the Llama 2 Community License Agreement.
+
 from unittest.mock import patch
 import importlib
 

tests/test_train_utils.py

@@ -1,3 +1,6 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# This software may be used and distributed according to the terms of the Llama 2 Community License Agreement.
+
 import torch
 
 from llama_recipes.utils.train_utils import train