[Php80] Keep trailing doc comment after annotation in AnnotationToAttributeRector

[TomasVotruba]

Fixes #9786

When AnnotationToAttributeRector converts a Symfony/Doctrine annotation to an attribute, a doc comment placed on the line(s) below the annotation was deleted along with it.

The doctrine annotation swallows that trailing comment into its original content, so removing the converted tag removed the comment too. A comment placed above the annotation was already kept (it is a separate text node) — only the comment after was lost.

Fix: split the trailing comment back out into its own docblock text node instead of dropping it.

Before

     /**
      * @Route("/path", name="action")
-     * this comment must be kept
      */
-    public function action()
+    #[Route(path: '/path', name: 'action')]
+    public function action()

After

-    /**
-     * @Route("/path", name="action")
-     * this comment must be kept
-     */
+    /**
+     * this comment must be kept
+     */
+    #[Route(path: '/path', name: 'action')]
     public function action()

Works for multi-line annotations too, and does not misread parentheses inside string values ("/path/(foo)") or leftover annotation syntax (a stray )) as a comment.

[TomasVotruba]

LGTM 👍