fix(dbs-dropdown): make to allow the search in supported db dropdown (#19125)

superset-frontend/src/views/CRUD/data/database/DatabaseModal/index.tsx

@@ -688,6 +688,7 @@ const DatabaseModal: FunctionComponent<DatabaseModalProps> = ({
         className="available-select"
         onChange={setDatabaseModel}
         placeholder={t('Choose a database...')}
+        showSearch
       >
         {[...(availableDbs?.databases || [])]
           ?.sort((a: DatabaseForm, b: DatabaseForm) =>