[Bugfix] fix mtp profile run error where main model and mtp model use different quantization (#4102)

### What this PR does / why we need it?
In PR https://github.com/vllm-project/vllm-ascend/pull/3420, we
initially placed the quantization type (quant_type) in the MoECommMethod
class. However, since MoECommMethod follows a singleton pattern, it
couldn't accommodate scenarios where different layers in the model might
use different quantization approaches (e.g., MTP modules using
floating-point computation while the main model employs quantized
computation).
In this PR, we've moved the quantization type to the AscendFusedMoe
class and pass it as a parameter to MoECommMethod.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
```bash
export HCCL_BUFFSIZE=1024
export VLLM_VERSION=0.11.0

vllm serve /home/data/DeepSeek-R1_w8a8/ \
 --data-parallel-size 2 \
 --tensor-parallel-size 8 \
 --enable-expert-parallel \
 --served-model-name dsv3 \
 --max-model-len 32768 \
 --max-num-batched-tokens 4096 \
 --max-num-seqs 16 \
 --quantization ascend \
 --trust-remote-code \
 --gpu-memory-utilization 0.9 \
 --speculative-config '{"num_speculative_tokens": 2, "method":"deepseek_mtp"}'
```


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

---------

Signed-off-by: realliujiaxu <realliujiaxu@163.com>

tests/ut/ops/test_moe_comm_method.py

@@ -7,6 +7,7 @@ from tests.ut.base import TestBase
 from vllm_ascend.ops.fused_moe.moe_comm_method import (AllGatherCommImpl,
                                                        AlltoAllCommImpl,
                                                        MC2CommImpl)
+from vllm_ascend.ops.fused_moe.prepare_finalize import QuantType
 
 
 class TestMoECommMethod(TestBase):
@@ -67,7 +68,7 @@ class TestMoECommMethod(TestBase):
 
         # Verify prepare was called with correct arguments
         mock_pf_instance.prepare.assert_called_once_with(
-            hidden_states, router_logits, False, False)
+            hidden_states, router_logits, False, False, QuantType.NONE)
 
         # Test finalize method
         comm_impl.finalize(h_out,
@@ -115,7 +116,7 @@ class TestMoECommMethod(TestBase):
 
         # Verify prepare was called with correct arguments
         mock_pf_instance.prepare.assert_called_once_with(
-            hidden_states, router_logits, False, False)
+            hidden_states, router_logits, False, False, QuantType.NONE)
 
         # Test finalize method
         comm_impl.finalize(h_out,
@@ -165,7 +166,7 @@ class TestMoECommMethod(TestBase):
 
         # Verify prepare was called with correct arguments
         mock_pf_instance.prepare.assert_called_once_with(
-            hidden_states, router_logits, False, False)
+            hidden_states, router_logits, False, False, QuantType.NONE)
 
     @patch("vllm_ascend.ops.fused_moe.moe_comm_method.get_current_vllm_config")
     @patch("vllm_ascend.ops.fused_moe.moe_comm_method.get_forward_context")