Function remove_file 

pub fn remove_file(
    report: &ScanReport,
    file_path: &str,
) -> Result<ScanReport, SimulateError>

Produce a ScanReport representing the codebase as if file_path did not exist. All facts referencing the file (and any functions defined in it) are dropped, and remaining file/function/call ids are renumbered so downstream consumers that index by id continue to work.