Do not add unused created attribute to metadata of couch documents on create (#7656)

this isn't used anywhere

Co-authored-by: Andrew Henry <akhenry@gmail.com>

src/plugins/persistence/couch/CouchObjectProvider.js

@@ -710,7 +710,7 @@ class CouchObjectProvider {
       this.objectQueue[key].pending = true;
       const queued = this.objectQueue[key].dequeue();
       let couchDocument = new CouchDocument(key, queued.model);
-      couchDocument.metadata.created = Date.now();
+
       this.#enqueueForPersistence({
         key,
         document: couchDocument