[BUGFIX] Avoid skipping ext_typoscript_* files in TS parser

A stupid return vs. continue issue breaks a loop
in SysTemplateTreeBuilder early, which leads to
`ext_typoscript_[setup|constants].typoscript` not
being considered when they have been partially
cached already.

Resolves: #101407
Related: #97816
Releases: main, 12.4
Change-Id: Ia96bfd10a0f2998b1baa1c5a153417b424ba05a2
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80220
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/core/Classes/TypoScript/IncludeTree/SysTemplateTreeBuilder.php

@@ -371,7 +371,7 @@ private function addExtensionStatics(IncludeInterface $parentNode): void
                     $node = $this->cache->require($identifier);
                     if ($node) {
                         $parentNode->addChild($node);
-                        return;
+                        continue;
                     }
                 }
                 $fileContent = file_get_contents($file);