[Pangu][MoE] Remove PanguProMoEV1 related code (#5088)

### What this PR does / why we need it?
PanguProMoEV1 is no longer supported in vllm-ascend, remove related
code.

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

### How was this patch tested?
e2e & ut

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

Signed-off-by: weichen <calvin_zhu0210@outlook.com>

vllm_ascend/ascend_forward_context.py

@@ -240,7 +240,6 @@ def select_moe_comm_method(num_tokens: int,
     quant_type = getattr(
         vllm_config.model_config.hf_config, 'moe_quantize',
         getattr(vllm_config.model_config.hf_config, 'quantize', None))
-    model_type = vllm_config.model_config.hf_config.model_type
 
     if not vllm_config.parallel_config.enable_expert_parallel:
         moe_comm_type = MoECommType.ALLGATHER
@@ -267,7 +266,4 @@ def select_moe_comm_method(num_tokens: int,
                          if fused_all2all_enable else MoECommType.ALLTOALL)
     else:
         raise ValueError(f"Unsupported soc_version: {soc_version}")
-    # PanguProMoE only supports allgather
-    if model_type == "PanguProMoE":
-        moe_comm_type = MoECommType.ALLGATHER
     return moe_comm_type