[CI][AMD][Quantization][BugFix] Fix fp8 max in quant_utils.py and update test_fp8_quant.::test_static_fp8_quant_group_2d to use correct fp8 dtype and adjust atol/rtol (#32201)

Signed-off-by: Randall Smith <ransmith@amd.com>

vllm/model_executor/layers/quantization/utils/quant_utils.py

@@ -221,7 +221,8 @@ def scaled_quantize(
     # Compute scales
     min_val, max_val = x_blkd_permd.aminmax(dim=-1)
     amax = torch.maximum(min_val.abs(), max_val.abs()).clamp(min=1e-12)
-    scale = finfo.max / amax
+    _, fp8_max = get_fp8_min_max()
+    scale = fp8_max / amax
 
     # Apply scale and convert form:
     # (BLK_M, BLK_N, BLOCK_SIZE_M * BLOCK_SIZE_N) to (M, N)