feat: add respect_gitignore config option

[xiaocang]

What does this PR do?

Adds a new respect_gitignore config option that controls whether .gitignore rules are respected when searching files.

How did you verify your code works?

• Tested with respect_gitignore: false and confirmed gitignored files (e.g., node_modules/, build artifacts) appear in glob/grep/ls results
• Tested with default config (no setting or respect_gitignore: true) and confirmed gitignored files are excluded as before

Fixed #7969

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

No duplicate PRs found