[CI] Enable linux-aarch64-a2 (64GB) and tp2 * 2 max-parallel to speed up CI (#2065)

### What this PR does / why we need it?
Currently our workflow run time takes about 3 hours in total, which
seriously affects the developer experience, so it is urgent to have a
optimization, after this pr, It is expected that the running time of the
full CI can be shortened to 1h40min.

- Enable linux-aarch64-a2 (64GB) to replace linux-arm64-npu (32GB)
- Change TP4 ---> TP2 * 2 max-parallel
- Move DeepSeek-V2-Lite-W8A8 to single card test

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


- vLLM version: v0.10.0
- vLLM main:
a2480251ec

---------

Signed-off-by: wangli <wangli858794774@gmail.com>

tests/e2e/multicard/test_torchair_graph_mode.py

@@ -30,7 +30,7 @@ os.environ["PYTORCH_NPU_ALLOC_CONF"] = "max_split_size_mb:256"
 def _deepseek_torchair_test_fixture(
     additional_config: Dict,
     *,
-    tensor_parallel_size=4,
+    tensor_parallel_size=2,
 ):
     example_prompts = [
         "Hello, my name is",
@@ -98,7 +98,7 @@ def test_e2e_deepseekv3_with_torchair_ms_mla():
 def _pangu_torchair_test_fixture(
     additional_config: Dict,
     *,
-    tensor_parallel_size=4,
+    tensor_parallel_size=2,
 ):
     example_prompts = [
         "Hello, my name is",