move spec decode slow test to test_areas.yaml (#33365)

Signed-off-by: shanjiaz <zsjwpianpian@gmail.com>

.buildkite/test_areas/misc.yaml

@@ -16,7 +16,7 @@ steps:
     - pytest -v -s v1/sample
     - pytest -v -s v1/logits_processors
     - pytest -v -s v1/worker
-    - pytest -v -s v1/spec_decode
+    - pytest -v -s -m 'not slow_test' v1/spec_decode
     - pytest -v -s -m 'not cpu_test' v1/kv_connector/unit
     - pytest -v -s -m 'not cpu_test' v1/metrics
     - pytest -v -s v1/test_oracle.py
@@ -167,3 +167,17 @@ steps:
     - pip install pytest-timeout pytest-forked
     - pytest -v -s v1/determinism/test_batch_invariance.py
     - pytest -v -s v1/determinism/test_rms_norm_batch_invariant.py
+  
+- label: Acceptance Length Test (Large Models) # optional
+  timeout_in_minutes: 25
+  gpu: h100
+  optional: true
+  num_gpus: 1
+  working_dir: "/vllm-workspace/tests"
+  source_file_dependencies:
+  - vllm/v1/spec_decode/
+  - vllm/model_executor/models/mlp_speculator.py
+  - tests/v1/spec_decode/test_acceptance_length.py
+  commands:
+    - export VLLM_ALLOW_INSECURE_SERIALIZATION=1
+    - pytest -v -s v1/spec_decode/test_acceptance_length.py -m slow_test

tests/v1/spec_decode/test_acceptance_length.py

@@ -35,7 +35,7 @@ class Eagle3ModelConfig:
     id: str = ""
     # Backends that are incompatible with this model (will be skipped)
     excluded_backends: set[AttentionBackendEnum] = field(default_factory=set)
-    # Pytest marks for this configuration (e.g., pytest.mark.optional)
+    # Pytest marks for this configuration
     marks: list = field(default_factory=list)
     # Custom relative tolerance (defaults to DEFAULT_RTOL if None)
     rtol: float | None = None