add llama 3.1 70b bf16 16node recipe and refine 405b recipe folder

Author: ngu3

training/a4x/llama3-1-405b/Chart.yaml …e/16node-FP8CS-GBS2048/recipe/Chart.yamltraining/a4x/llama3-1-405b/Chart.yaml renamed to training/a4x/llama3-1-405b/nemo-pretraining-gke/16node-FP8CS-GBS2048/recipe/Chart.yaml training/a4x/llama3-1-405b/Chart.yaml renamed to training/a4x/llama3-1-405b/nemo-pretraining-gke/16node-FP8CS-GBS2048/recipe/Chart.yaml

@@ -0,0 +1,20 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: v2
+name: a4_jobset_workload
+description: a4_jobset_workload
+type: application
+version: 0.1.0
+appVersion: "1.16.0"