Revert "[V1] Scatter and gather placeholders in the model runner" (#16075)

tests/models/decoder_only/vision_language/test_pixtral.py

@@ -176,8 +176,6 @@ def test_chat(
             model,
             dtype=dtype,
             tokenizer_mode="mistral",
-            load_format="mistral",
-            config_format="mistral",
             max_model_len=max_model_len,
             limit_mm_per_prompt=LIMIT_MM_PER_PROMPT,
     ) as vllm_model:
@@ -200,14 +198,22 @@ def test_chat(
 
 
 @large_gpu_test(min_gb=48)
-@pytest.mark.parametrize("prompt,expected_ranges",
-                         [(_create_engine_inputs_hf(IMG_URLS[:1]),
-                           [PlaceholderRange(offset=11, length=494)]),
-                          (_create_engine_inputs_hf(IMG_URLS[1:4]), [
-                              PlaceholderRange(offset=11, length=266),
-                              PlaceholderRange(offset=277, length=1056),
-                              PlaceholderRange(offset=1333, length=418)
-                          ])])
+@pytest.mark.parametrize(
+    "prompt,expected_ranges",
+    [(_create_engine_inputs_hf(IMG_URLS[:1]), [{
+        "offset": 11,
+        "length": 494
+    }]),
+     (_create_engine_inputs_hf(IMG_URLS[1:4]), [{
+         "offset": 11,
+         "length": 266
+     }, {
+         "offset": 277,
+         "length": 1056
+     }, {
+         "offset": 1333,
+         "length": 418
+     }])])
 def test_multi_modal_placeholders(vllm_runner, prompt,
                                   expected_ranges: list[PlaceholderRange],
                                   monkeypatch) -> None: