Fix: Use Node.js script for cross-platform file copying in build

- Replaces the rsync command in the build_package.sh script with a
  Node.js script (copy_files.cjs) to handle copying necessary files
  (e.g., .md, .json, .sb) during the build process.
- Addresses an issue where the build would fail on systems
  that do not have rsync installed (e.g., some Windows environments or
  minimal Linux distributions) by using a Node.js script, providing a
  cross-platform solution as Node.js is already a project dependency.
- Updates the ESLint configuration to correctly lint .cjs files as
  CommonJS modules.

Fixes https://github.com/google-gemini/gemini-cli/issues/387

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