Sends the user to a different installer page.
This issues an on-site HTTP redirect. Messages (and errors) are erased.
$path: An installer path.
function install_goto($path) {
global $base_url;
$headers = array(
// Not a permanent redirect.
'Cache-Control' => 'no-cache',
);
$response = new RedirectResponse($base_url . '/' . $path, 302, $headers);
$response
->send();
}