fix(test): unify greedy expected output across platforms

The Eiffel Tower generation is "one of" on all platforms (trn1, inf2,
trn2), not just trn2. Remove the platform-dependent branch that caused
CI failures on non-trn2 runners.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: dacorvo

tests/vllm/engine/test_vllm_engine_generate.py

@@ -10,7 +10,6 @@
 from vllm import LLM, RequestOutput, SamplingParams
 from vllm.platforms import current_platform
 
-from optimum.neuron.utils.instance import current_instance_type
 from optimum.neuron.vllm.platform import OptimumNeuronPlatform
 
 
@@ -95,10 +94,9 @@ def test_vllm_greedy_expectations(neuron_llm_config: dict[str, Any]):
 
     outputs = llm.generate(prompts, sampling_params)
 
-    trn2 = current_instance_type() == "trn2"
     expected_outputs = [
         " the head of state and government of the United States",
-        " Paris. The Eiffel Tower is located in Paris. The Eiffel Tower is " + ("one of" if trn2 else "a famous"),
+        " Paris. The Eiffel Tower is located in Paris. The Eiffel Tower is one of",
         " The world was holding its breath as the world's top scientists and engineers gathered at the secret underground facility to witness the unveiling of the ultimate time machine.",
         " to find happiness and fulfillment in the present moment. It's a simple yet profound concept that can bring joy and peace to our lives.\n\nAs I reflect on my own life, I realize that I've",
         " blue, but what about the colour of the sky",