pub fn scan_files_for_seeds(
graph: &PythonGraphSource<'_>,
python: &dyn PythonUsageSource,
project_graph: &PythonProjectGraph,
files: &HashSet<ProjectFile>,
target: &CodeUnit,
seeds: &BTreeSet<(ProjectFile, String)>,
cancellation: Option<&CancellationToken>,
) -> ScanResult