fix: replace exists+create with try/catch for vectorsdb metadata init

src/Appwrite/Platform/Modules/Databases/Http/VectorsDB/Collections/Create.php

@@ -130,9 +130,9 @@ class Create extends CollectionAction
             $indexes[] = new Document($index);
         }
         try {
-            // passing null in creates only creates the metadata collection
-            if (!$dbForDatabases->exists(null, Database::METADATA)) {
+            try {
                 $dbForDatabases->create();
+            } catch (DuplicateException) {
             }
             $dbForDatabases->createCollection(
                 id: 'database_' . $database->getSequence() . '_collection_' . $collection->getSequence(),