Function resolve_package_files 

pub fn resolve_package_files(
    name: &str,
    source: &Source,
    action: PreflightAction,
) -> Result<PackageFileInfo, String>

What: Dispatch to the correct file resolution routine based on preflight action.

Inputs:

• name: Package name being evaluated.
• source: Package source needed for install lookups.
• action: Whether the package is being installed or removed.

Output:

• Returns a PackageFileInfo on success or an error message.

Errors

• Returns Err when file resolution fails for install or remove operations (see resolve_install_files and resolve_remove_files)

Details:

• Delegates to either resolve_install_files or resolve_remove_files.