Optimize partial archive extraction on split archives

[fnoah]

subprocess.run(["tar", "-xvf", archive_path, "-C", destination_directory_path, partial_extraction_path])

Although only extracting a subpath from an encrypted tar archive is more efficient than extracting the complete archive, it still doesn't make sense to perform this operation on every archive part. Instead, the extract action should only be performed archive parts which we know contain the given subpath.