[Model] Support Nemotron models (Nemotron-3, Nemotron-4, Minitron) (#6611)

.buildkite/lm-eval-harness/configs/Minitron-4B-Base.yaml

@@ -0,0 +1,11 @@
+# bash .buildkite/lm-eval-harness/run-lm-eval-gsm-vllm-baseline.sh -m nvidia/Minitron-4B-Base -b auto -l 1000 -f 5 -t 1
+model_name: "nvidia/Minitron-4B-Base"
+tasks:
+- name: "gsm8k"
+  metrics:
+  - name: "exact_match,strict-match"
+    value: 0.252
+  - name: "exact_match,flexible-extract"
+    value: 0.252
+limit: 1000
+num_fewshot: 5