We don't get the packages to process in a consistent order, and the
order of the data in the associative arrays in composer-plugin's
`i18n-map.php` and the autoloader's `jetpack_autoloader_classmap.php`
doesn't matter. So let's sort those arrays so diffs are cleaner.

Note the data for the autoloader files (`jetpack_autoloader_filemap.php`
and `jetpack_autoloader_psr4.php`) is already sorted when it's
generated, so we don't have to do anything for those.

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/3290384280