add new test model for aclgraph single_request

[lilinsiman]

What this PR does / why we need it?

add new test model for aclgraph single_request

Does this PR introduce any user-facing change?

no

How was this patch tested?

ut

• vLLM version: v0.11.0
• vLLM main: vllm-project/vllm@83f478b

[github-actions]

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[gemini-code-assist]

Code Review

This pull request adds a new test model, vllm-ascend/DeepSeek-V2-Lite-W8A8, to the single_request_aclgraph end-to-end test. My review identifies a critical issue with how server arguments are constructed for this new model, which would cause the test to fail. I've provided a code suggestion to fix the bug and refactor the code for better readability and maintainability.

[gemini-code-assist]

The server arguments for the new model vllm-ascend/DeepSeek-V2-Lite-W8A8 are incorrect. The arguments "quantization" and "ascend" are misplaced and will cause the argument parser to fail. They should be passed as "--quantization", "ascend".

Additionally, there is significant code duplication between the if and else blocks. This can be refactored to improve readability and maintainability by defining the common arguments first and then conditionally adding the model-specific ones.

Suggested change

	if model == "vllm-ascend/DeepSeek-V2-Lite-W8A8":
	server_args = [
	"--no-enable-prefix-caching", "--tensor-parallel-size", "1",
	"--data-parallel-size",
	"--data-parallel-size", "quantization", "ascend",
	str(dp_size), "--port",
	str(port), "--trust-remote-code", "--gpu-memory-utilization", "0.9"
	]
	else:
	server_args = [
	"--no-enable-prefix-caching", "--tensor-parallel-size", "1",
	"--data-parallel-size",
	str(dp_size), "--port",
	str(port), "--trust-remote-code", "--gpu-memory-utilization", "0.9"
	]
	server_args = [
	"--no-enable-prefix-caching", "--tensor-parallel-size", "1",
	"--data-parallel-size", str(dp_size),
	"--port", str(port),
	"--trust-remote-code", "--gpu-memory-utilization", "0.9"
	]
	if model == "vllm-ascend/DeepSeek-V2-Lite-W8A8":
	server_args.extend(["--quantization", "ascend"])