debug_aclgraph_sizes_capture (#2827)

### What this PR does / why we need it?
1. Solved the problem that in the Qwen3 Moe model case, opening DP would
use an extra stream, causing ACLgraph sizes capture error
2. After experimentation, it was found that in many cases, some
operators would occupy more streams than expected. Therefore, the buffer
area for streams in ACLgraph was not large enough. After discussion,
extra 120 streams were added as buffer.

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

### How was this patch tested?
ut

- vLLM version: main
- vLLM main:
0ae43dbf8c

Signed-off-by: lilinsiman <lilinsiman@gmail.com>

tests/ut/test_utils.py

@@ -259,7 +259,7 @@ class TestUtils(TestBase):
         utils.update_aclgraph_sizes(test_vllm_config)
         del os.environ['HCCL_OP_EXPANSION_MODE']
         self.assertEqual(
-            147,
+            138,
             len(test_vllm_config.compilation_config.cudagraph_capture_sizes))
 
         test_vllm_config.speculative_config = mock.MagicMock()
@@ -272,7 +272,7 @@ class TestUtils(TestBase):
         utils.update_aclgraph_sizes(test_vllm_config)
         del os.environ['HCCL_OP_EXPANSION_MODE']
         self.assertEqual(
-            120,
+            112,
             len(test_vllm_config.compilation_config.cudagraph_capture_sizes))
 
         # max_num_batch_sizes >= len(original_sizes)