[FEATURE] Allow setting documents

To be in sync with old implementations it is helpful to e.g. remove the documents completly or just modify it how I like it

Classes/Event/Indexing/BeforeDocumentsAreIndexedEvent.php

@@ -29,7 +29,7 @@
  * Previously used with
  * $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['solr']['IndexQueueIndexer']['preAddModifyDocuments']
  */
-class BeforeDocumentsAreIndexedEvent
+final class BeforeDocumentsAreIndexedEvent
 {
     public function __construct(
         private readonly Document $document,
@@ -75,6 +75,14 @@ public function getDocuments(): array
         return $this->documents;
     }
 
+    /**
+     * @param Document[] $documents
+     */
+    public function setDocuments(array $documents): void
+    {
+        $this->documents = $documents;
+    }
+
     public function getTsfe(): TypoScriptFrontendController
     {
         return clone $this->tsfe;