[env] fix: Improve License Check Hook Flexibility

[slimfrkha]

What does this PR do?

Solve #3201

Problem

The existing license check hook scans all directories recursively from a single root directory, which causes issues in local development environments:

• Virtual environments (.venv, venv/) get scanned and fail license checks
• No easy way to exclude common build/cache directories without hardcoding exclusions
• Different behavior between local development (with venvs) and CI/CD (clean environment)

Solution

Modified the check_license.py script to accept multiple target directories instead of a single root directory with exclusions.

Design & Code Changes

Changed argument from --directory to --directories

• Now accepts multiple Path arguments using nargs="+"
• Allows specifying exactly which directories to scan
• in local mode: --directories examples recipe scripts tests verl setup.py
• in github workflow: --directories .

[gemini-code-assist]

Code Review

This pull request improves the flexibility of the license check hook by allowing multiple directories to be specified. This is a good improvement for local development environments. My review identifies a critical issue where the script does not correctly handle individual file paths (like setup.py) passed as arguments, which would cause them to be skipped during the license check. I've provided a code suggestion to fix this by handling both directory and file paths correctly.