Do we need select_one_from_external_file support?

[dave-mills]

In the history of us doing weird things with ODK, we have veryy occasionally needed to use select_one_from_external_file with a csv file generated from a database. This means doing something special to make sure it is in the valid format:

Copied from a previous version:

        // If the csv file is used with "select_one_from_external_file" (or multiple) it must not have any enclosure characters:
        if (isset($lookup['external_file']) && $lookup['external_file'] === '1') {
            $contents = Storage::disk(config('filament-odk-link.storage.xlsforms'))->get($filePath);
            $contents = Str::of($contents)->replace('"', '');

            Storage::disk(config('filament-odk-link.storage.xlsforms'))->put($filePath, $contents);
        }

TODO: consider if we still need this, and implement it if we do!