[Bugfix] Fix deepseek percision issue and add acc ci for it (#905)

### What this PR does / why we need it?
Fix deepseek percision issue on V0 and add acc ci for it
Fixes https://github.com/vllm-project/vllm-ascend/issues/1062
### How was this patch tested?
CI passed with new added test.

Signed-off-by: MengqingCao <cmq0113@163.com>

vllm_ascend/quantization/w8a8_dynamic.py

@@ -624,6 +624,8 @@ class AscendW8A8DynamicFusedMoEMethod:
         if enable_force_load_balance:
             topk_ids = torch.randint_like(topk_ids, 0, global_num_experts)
 
+        topk_weights = topk_weights.to(x.dtype)
+
         if VLLM_ENABLE_MC2 and not is_prefill:
             return fused_experts_with_mc2(
                 hidden_states=x,