[bugfix]fix file not found error in nightly of single-node (#6976)

### What this PR does / why we need it?
1. The **main image build** takes approximately **two hours**. The main
image build time needs to be moved forward to **21pm(UTC+8)** to ensure
that the nightly image build can use the latest main image.
``` bash
schedule:
   # UTC+8: 8am, 12pm, 16pm, 22pm
   - cron: '0 0,4,8,14 * * *'
```
--->
``` bash
schedule:
   # UTC+8: 8am, 12pm, 16pm, 21pm
   - cron: '0 0,4,8,13 * * *'
```
Link:
https://github.com/vllm-project/vllm-ascend/actions/runs/22632712302/job/65641055135#step:8:26

2. The nightly test is encountering the following error: 
``` bash
ImportError: ascend_transport.so: cannot open shared object file: No such file or directory.
```
Path need to be added：
``` bash
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib" >> ~/.bashrc
```
Link:
https://github.com/vllm-project/vllm-ascend/actions/runs/22632712302/job/65641054911#step:7:529
### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

- vLLM version: v0.16.0
- vLLM main:
15d76f74e2

---------

Signed-off-by: MrZ20 <2609716663@qq.com>

.github/workflows/_e2e_nightly_single_node_models.yaml

@@ -186,6 +186,7 @@ jobs:
           TORCH_NPU_VERSION: ${{ env.GHA_TORCH_NPU_VERSION }}
         run: |
           mkdir -p ./benchmarks/accuracy
+          echo "export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib" >> ~/.bashrc
           echo "Received model_list: ${{ inputs.model_list }}"
           models=$(echo '${{ inputs.model_list }}' | jq -r '.[]')
           any_failure=0