ci: add pip/pre-commit cache and fix mirror override in NPU CI

[JavaPythonAIForBAT]

Summary

• lint.yaml: upgrade actions/setup-python to v5 with built-in cache: pip enabled; add actions/cache@v4 for pre-commit environments keyed on .pre-commit-config.yaml hash
• citest_npu.yaml: add actions/cache@v4 for ~/.cache/pip keyed on requirements/framework.txt and requirements/tests.txt hashes, reducing redundant pip downloads across runs
• ci_container_test.sh: remove explicit -i https://mirrors.aliyun.com/pypi/simple/ flags from all pip install commands so they use the internal cache server already configured in the Config mirrors step, rather than overriding it

Motivation

The Config mirrors step in citest_npu.yaml correctly sets the internal K8s pip cache service via pip config set global.index-url, but ci_container_test.sh was overriding this with explicit -i flags pointing to the public Aliyun mirror. This PR fixes the inconsistency and adds standard pip/pre-commit caching to speed up CI.

Test plan

• Lint workflow: verify pre-commit cache is restored on subsequent runs
• NPU CI: verify pip cache is restored and ci_container_test.sh uses the configured index URL

[gemini-code-assist]

Code Review

This pull request removes the Aliyun PyPI mirror from the pip install commands within the CI container test script. The reviewer suggests enhancing the script's reliability by adding error handling to the installation steps to prevent the CI from proceeding if dependencies fail to install. Furthermore, combining multiple pip install calls into a single command was recommended for better efficiency and dependency resolution.

[gemini-code-assist]

It is recommended to add error handling to the pip install command. Without it, if the installation of test dependencies fails, the script will continue to subsequent steps (like pre-commit), which may lead to misleading failures or unreliable test results in CI.

Suggested change

	pip install -r requirements/tests.txt
	pip install -r requirements/tests.txt || exit 1

[gemini-code-assist]

These two pip install commands can be combined into a single invocation. This is more efficient as it reduces the overhead of starting the pip process multiple times and allows the dependency resolver to handle all packages together, ensuring consistency. Additionally, adding || exit 1 ensures the script terminates immediately if the installation fails.

Suggested change

	pip install -r requirements/framework.txt -U
	pip install decord einops -U
	pip install -r requirements/framework.txt decord einops -U || exit 1

[gemini-code-assist]

Adding error handling here ensures that the script does not proceed to run the tests if these dependencies fail to install, which helps in identifying environment setup issues early and prevents running tests in an incomplete environment.

Suggested change

	pip install auto_gptq bitsandbytes deepspeed -U
	pip install auto_gptq bitsandbytes deepspeed -U || exit 1