[CI] Add custom op to nightly (#3765)

### What this PR does / why we need it?
1. Add custom op to nightly tests, fix
https://github.com/vllm-project/vllm-ascend/pull/3665
2. Correctly pass github secrets when using workflow_call, see
https://docs.github.com/en/actions/how-tos/reuse-automations/reuse-workflows
3. Fix the single node mutual cancellation issue

- vLLM version: v0.11.0rc3
- vLLM main:
c9461e05a4

---------

Signed-off-by: wangli <wangli858794774@gmail.com>

.github/workflows/vllm_ascend_test_nightly_a2.yaml

@@ -53,6 +53,9 @@ jobs:
           - name: qwen3-32b-in8-a2
             os: linux-aarch64-a2-4
             tests: tests/e2e/nightly/models/test_qwen3_32b_int8.py
+          - name: test_custom_op
+            os: linux-aarch64-a2-1
+            tests: tests/e2e/nightly/ops
     uses: ./.github/workflows/_e2e_nightly_single_node.yaml
     with:
       vllm: v0.11.0