[Test][e2e][LoRA] Add more e2e tests to cover scenarios of LoRA (#4075)

### What this PR does / why we need it?

This PR depends on PR
https://github.com/vllm-project/vllm-ascend/pull/4046. And only if the
latter merged, it will work.

This PR aims to solve the issue
https://github.com/vllm-project/vllm-ascend/issues/3240.

The new-added Llama-2-7b-hf and Qwen3-0.6B testcases will cover the
senarios that the LoRA weights are added to q_proj, v_proj, k_proj,
o_proj, gate_proj, up_proj, down_proj, embed_tokens and lm_head modules.

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
pytest -sv tests/e2e/singlecard/test_llama2_lora.py
pytest -sv tests/e2e/singlecard/test_qwen3_multi_loras.py


- vLLM version: v0.11.0
- vLLM main:
83f478bb19

---------

Signed-off-by: paulyu12 <507435917@qq.com>

tests/e2e/conftest.py

@@ -756,6 +756,11 @@ def ilama_lora_files():
     return snapshot_download(repo_id="vllm-ascend/ilama-text2sql-spider")
 
 
+@pytest.fixture(scope="session")
+def llama32_lora_files():
+    return snapshot_download(repo_id="vllm-ascend/llama32-3b-text2sql-spider")
+
+
 def qwen_prompt(questions: list[str]) -> list[str]:
     placeholder = "<|image_pad|>"
     return [("<|im_start|>system\nYou are a helpful assistant.<|im_end|>\n"