Function find_packages_for_rollback 

pub async fn find_packages_for_rollback(
    partitioned: &HashMap<Ecosystem, Vec<String>>,
    options: &CrawlerOptions,
    silent: bool,
) -> HashMap<String, PathBuf>

Variant of find_packages_for_purls for rollback and narrow-release resolution, which needs to remap qualified PURLs (PyPI ?artifact_id=, RubyGems ?platform=, Maven ?classifier=&ext=) to the base PURL found by the crawler.