[CI] refine check_api_label_cn

[ooooo-create]

• use Path to deal with file path
• add precompile regex patterns
• api_label 引用的检查新增存量的 api 目录，避免删除 api 时，遗漏引用
• 先收集错误，再集中报错

[paddle-bot]

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ci_scripts/check_api_label_cn.py:170

• [nitpick] The variable name 'API' is ambiguous; consider renaming it to a more descriptive name such as 'relative_api_path' to clarify its purpose.

API = args.doc_root.removesuffix(args.api_root)

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ci_scripts/check_api_label_cn.py:170

• [nitpick] The variable 'API' is not self-explanatory; consider renaming it to something more descriptive, such as 'api_subpath', to clarify its purpose.

API = args.doc_root.removesuffix(args.api_root)

ci_scripts/check_api_label_cn.py:56

• [nitpick] Consider using a consistent type for 'file_path' (either Path or str) to reduce type handling complexity and improve clarity.

def find_api_labels_in_file(file_path: Path | str) -> list[str]:

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ci_scripts/check_api_label_cn.py:86

• [nitpick] Consider renaming the loop variable 'file' to a more descriptive name (e.g., 'doc_file') to avoid shadowing the built-in 'file' identifier.

for file in files: