Add newline at end of file for many tests

Add the newline in reconstructTest() and run updateTests.php, to
reduce spurious diffs in the future.

Remove MODIFIER_ prefix from node dumps

These constants are now called Modifiers::PUBLIC rather than
Class_::MODIFIER_PUBLIC etc, so update the dumped name as well.

Remove PHP 5 parser

[PHP 8.2] Add readonly class support (#834)

RFC: https://wiki.php.net/rfc/readonly_classes

PHP implementation: php/php-src#7305