chore: internal testing

FUTURE_COPYBARA_INTEGRATE_REVIEW=#1090 from googleapis:release-please--branches--main--components--genai bbf62d2
PiperOrigin-RevId: 834031212

Author: wanlin31

src/index.ts

@@ -4,6 +4,12 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+// copybara:strip_begin(google-internal)
+// internal testing
+// copybara:strip_end
+
+// Testing
+
 export {BaseUrlParameters, setDefaultBaseUrls} from './_base_url';
 export * from './batches';
 export * from './caches';