[tests] Fix expected output for Qwen2.5-VL batch_wo_image on CUDA (#47968)

[tests] Fix expected output for qwen2_5_vl batch_wo_image on CUDA

Update the (None, None) expected string for
`test_small_model_integration_test_batch_wo_image` to match actual
model output on CUDA A10G: "a large language model" / "a wide range
of tasks" instead of "an AI language model" / "various tasks".

Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>