[Bugfix] install trition for test_custom_op (#5112)

### What this PR does / why we need it?
1. install trition for test_custom_op
2. tests/e2e/nightly/ops test timeout, set timeout-minutes let it test
over:

https://github.com/vllm-project/vllm-ascend/actions/runs/20326482497/job/58392757707?pr=5112
3. ignore test_dispatch_ffn_combine until it is fixed @kiscad 

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

### How was this patch tested?

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

Signed-off-by: hfadzxy <starmoon_zhang@163.com>

.github/workflows/nightly_test_a2.yaml

@@ -63,6 +63,7 @@ jobs:
       vllm: v0.12.0
       runner: ${{ matrix.test_config.os }}
       tests: ${{ matrix.test_config.tests }}
+      name: ${{ matrix.test_config.name }}
       image: 'swr.cn-southwest-2.myhuaweicloud.com/base_image/ascend-ci/vllm-ascend:nightly-a2'
 
   single-node-accuracy-tests: