Add a filter to provide fine grained control over user caps

[nlemoine]

I first thought to place the filter on the capability but playing directly with the result will give more freedom.

add_filter('wp_environment_switcher_can_show_menu', function(bool $can_view): bool {
    $user = wp_get_current_user();
    if ($user && $user->user_email === 'me') {
         return true;
    }
    
    return $can_view;
};