feat: [CI] Introduce uv to accelerate pip install (#7127)

### What this PR does / why we need it?
Integrates uv: Significantly accelerates pip install execution and
resolves concurrency issues caused by traditional pip caching
mechanisms.

Why pip install uc-manager is explicitly added:
This project depends on uc-manager. However, installing it via uv pip
install uc-manager currently fails due to a known issue. An issue has
already been filed with the upstream uv repository to address this.
Consequently, we explicitly invoke pip install uc-manager as a temporary
workaround to ensure the build succeeds.
https://github.com/ModelEngine-Group/unified-cache-management/issues/736

Why use UV_SYSTEM_PYTHON: 1:
No virtual environment has been created yet; this configuration has the
same effect as directly using `pip install`.

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

Signed-off-by: tfhddd <2272751277@qq.com>

.github/workflows/_pre_commit.yml

@@ -50,9 +50,17 @@ jobs:
 
     - name: Install vllm-ascend dev (conditional)
       if: steps.filter.outputs.lint_tracker == 'true'
+      env:
+        UV_INDEX_URL: http://cache-service.nginx-pypi-cache.svc.cluster.local/pypi/simple
+        UV_EXTRA_INDEX_URL: https://mirrors.huaweicloud.com/ascend/repos/pypi
+        UV_INDEX_STRATEGY: unsafe-best-match
+        UV_NO_CACHE: 1
+        UV_SYSTEM_PYTHON: 1
       run: |
+        pip install uv
         git config --global --add safe.directory /__w/vllm-ascend/vllm-ascend
-        pip install -r requirements-dev.txt --extra-index-url https://download.pytorch.org/whl/cpu
+        pip install uc-manager
+        uv pip install -r requirements-dev.txt --extra-index-url https://download.pytorch.org/whl/cpu
 
     - name: Run pre-commit
       env: