[Tests][NVFP4] Add e2e nvfp4 test (#1543)

Summary
- Will use marlin until blackwell runners are enabled

Author: dsikka

tests/e2e/vLLM/configs/fp4_nvfp4.yaml

@@ -0,0 +1,7 @@
+cadence: "nightly"
+test_type: "regression"
+model: TinyLlama/TinyLlama-1.1B-Chat-v1.0
+scheme: NVFP4
+num_calibration_samples: 20
+dataset_id: HuggingFaceH4/ultrachat_200k
+dataset_split: train_sft