WordPress build: Add newlines after PHP annotations

[adamziel]

Adds a newline character after every PHP annotation.

Rationale

Loading WordPress on PHP 7.4 yields the following error:

Parse error: syntax error, unexpected 'has' (T_STRING) in /wordpress/wp-includes/class-wp-recovery-mode-email-service.php on line 4

This is caused by the minification of PHP files via php -w.

PHP 8.0, which is currently used, outputs:

<?php
 #[AllowDynamicProperties] final class WP_Recovery_Mode_Email_Service {  /* ... code ... */ $message = __( 'Howdy!', '

WordPress has a built-in feature ...

The class declaration is treated as a comment by PHP 7.4.

However, PHP 7.4 outputs:

<?php
final class WP_Recovery_Mode_Email_Service {  /* ... code ... */ $message = __( 'Howdy!', '

WordPress has a built-in feature ...

Note the missing annotation.

Closes #985

Testing instructions

Confirm the CI tests pass