feat(gitlab_glab): add diff content filtering to get_mr_diff

- Add filter_diff_content method to filter out unwanted file extensions
- Default filtering excludes .lock and .log files to reduce noise
- Smart lock file detection handles package-lock.json, yarn.lock, etc.
- Customizable filtering via filter_extensions parameter
- Filtering can be disabled by passing empty list
- Add comprehensive tests for all filtering scenarios
- Update README.md with filtering documentation
- Maintain backward compatibility with existing API

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