[Deprecation][2/N] Replace --task with --runner and --convert (#21470)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>
Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
Co-authored-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

tests/models/test_transformers.py

@@ -33,6 +33,10 @@ def check_implementation(
     args = (example_prompts, max_tokens, num_logprobs)
 
     with runner_test(model, **kwargs_test, **kwargs) as model_test:
+        model_config = model_test.llm.llm_engine.model_config
+        assert model_config.architecture == (
+            model_config._get_transformers_backend_cls())
+
         outputs_test = model_test.generate_greedy_logprobs(*args)
 
     with runner_ref(model, **kwargs_ref) as model_ref:
@@ -130,8 +134,13 @@ def test_quantization(
             model_impl="transformers",
             enforce_eager=True,
             **quantization_kwargs) as vllm_model:  # type: ignore[arg-type]
+        model_config = vllm_model.llm.llm_engine.model_config
+        assert model_config.architecture == (
+            model_config._get_transformers_backend_cls())
+
         transformers_outputs = vllm_model.generate_greedy_logprobs(
             example_prompts, max_tokens=max_tokens, num_logprobs=num_logprobs)
+
     check_logprobs_close(
         outputs_0_lst=transformers_outputs,
         outputs_1_lst=vllm_outputs,
@@ -151,7 +160,6 @@ def test_classify(
     example_prompts,
     model: str,
     dtype: str,
-    monkeypatch,
 ) -> None:
     import torch
     from transformers import AutoModelForSequenceClassification
@@ -160,6 +168,10 @@ def test_classify(
                      max_model_len=512,
                      dtype=dtype,
                      model_impl="transformers") as vllm_model:
+        model_config = vllm_model.llm.llm_engine.model_config
+        assert model_config.architecture == (
+            model_config._get_transformers_backend_cls())
+
         vllm_outputs = vllm_model.classify(example_prompts)
 
     with hf_runner(model,