Merge "fs_mgr_overlayfs: Trim surrounding "@" from the per mountpoint scratch dir name" into main

    if (mount_point.empty() || !android::base::Realpath(mount_point, &normalized_path)) {

        return "";

    }

    return android::base::StringReplace(normalized_path, "/", "@", true);

    std::string_view sv(normalized_path);

    if (sv != "/") {

        android::base::ConsumePrefix(&sv, "/");

        android::base::ConsumeSuffix(&sv, "/");

    }

    return android::base::StringReplace(sv, "/", "@", true);

}

static bool fs_mgr_is_dir(const std::string& path) {