Build/Test Tools: Include GlobalDocBlockVisitor in PHPStan analyzed paths.

Without this, PHPStan emits a "Result cache might not behave correctly" warning because the visitor class is registered as a service but lives outside the analysed paths, so edits to the file do not invalidate the result cache.

Adds the file specifically (rather than the whole `tests/phpstan/` directory) to avoid analyzing `bootstrap.php` and `baseline.php`, which are not intended as analysis subjects.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: westonruter

tests/phpstan/base.neon

@@ -98,6 +98,7 @@ parameters:
 		- ../../src/wp-signup.php
 		- ../../src/wp-trackback.php
 		- ../../src/xmlrpc.php
+		- GlobalDocBlockVisitor.php
 	bootstrapFiles:
 		- bootstrap.php
 	scanFiles: