[MoE] [Refactor] Combine common_fused_moe and fused_moe (#3176)

### What this PR does / why we need it?
1. Move additional functionalities from fused_moe.py to
common_fused_moe.py and remove fused_moe.py
2. Remove unnecessary custom classes from qwen3_moe.py, and it will be
completely removed after we release vllm-ascend v0.11.0

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

### How was this patch tested?

Qwen3-30B-A3B/Qwen3-30B-A3B-W8A8/DeepSeek-V3-W4A8-Pruing/deepseek-mtp/pangu-pro-moe-pruing:

1. Enable/Disable EP
3. Aclgraph & eager
4. SP


- vLLM version: v0.11.0

---------

Signed-off-by: Pr0Wh1teGivee <calvin_zhu0210@outlook.com>
Co-authored-by: weijinqian0 <12153182+weijinqian0@users.noreply.github.com>

tests/ut/ops/test_moe_comm_method.py

@@ -63,7 +63,7 @@ class TestMoECommMethod(TestBase):
 
         # Verify prepare was called with correct arguments
         mock_pf_instance.prepare.assert_called_once_with(
-            hidden_states, router_logits, False, False, False, None)
+            hidden_states, router_logits, False, False, None)
 
         # Test finalize method
         comm_impl.finalize(h_out, reduce_results=True)
@@ -108,7 +108,7 @@ class TestMoECommMethod(TestBase):
 
         # Verify prepare was called with correct arguments
         mock_pf_instance.prepare.assert_called_once_with(
-            hidden_states, router_logits, False, False, False, None)
+            hidden_states, router_logits, False, False, None)
 
         # Test finalize method
         comm_impl.finalize(h_out, reduce_results=True)
@@ -153,7 +153,7 @@ class TestMoECommMethod(TestBase):
 
         # Verify prepare was called with correct arguments
         mock_pf_instance.prepare.assert_called_once_with(
-            hidden_states, router_logits, False, False, False, None)
+            hidden_states, router_logits, False, False, None)
 
     @patch("vllm_ascend.ops.moe.moe_comm_method.get_current_vllm_config")
     @patch("vllm_ascend.ops.moe.moe_comm_method.get_forward_context")