[EPLB][Bugfix]Reduce unnecessary video memory usage (#6020)

### What this PR does / why we need it?
1.Incorporate the warm up of the EPLB into the profile run.
2.Reusing the same gather buffer

### Does this PR introduce _any_ user-facing change?

### How was this patch tested?
qwen3-235b aime baseline
| dataset | version | metric | mode | vllm-api-general-chat |
|----- | ----- | ----- | ----- | -----|
| aime2024 | 604a78 | accuracy | gen | 86.67 |

eplb The OOM issue does not occur.
| dataset | version | metric | mode | vllm-api-general-chat |
|----- | ----- | ----- | ----- | -----|
| aime2024 | 604a78 | accuracy | gen | 86.67 |

- vLLM version: v0.13.0
- vLLM main:
2c24bc6996

Signed-off-by: shenchuxiaofugui <1311027364@qq.com>

vllm_ascend/eplb/core/eplb_device_transfer_loader.py

@@ -60,7 +60,6 @@ class D2DExpertWeightLoader:
                 layer_id][global_expert_id_to_send].item()
             for src_tensor in self.eplb_adaptor.expert_param_per_layer[
                     layer_id][local_expert_id]:
-                src_tensor = src_tensor.clone()
                 self.comm_op_list.append(
                     dist.P2POp(dist.isend, src_tensor, dst_rank))