branch-2.1: [fix](meta-cache) fix refreshOnlyCatalogCache when use_meta_cache = false #44363 (#44461)

Cherry-picked from #44363

Co-authored-by: Socrates <suyiteng@selectdb.com>

fe/fe-core/src/main/java/org/apache/doris/datasource/ExternalCatalog.java

@@ -412,6 +412,7 @@ public abstract class ExternalCatalog
             if (useMetaCache.get() && metaCache != null) {
                 metaCache.invalidateAll();
             } else if (!useMetaCache.get()) {
+                this.initialized = false;
                 for (ExternalDatabase<? extends ExternalTable> db : idToDb.values()) {
                     db.setUnInitialized(invalidCache);
                 }