gcp retry-test setup fix (#125181)

Author: mhl-b

modules/repository-gcs/src/test/java/org/elasticsearch/repositories/gcs/GoogleCloudStorageBlobContainerRetriesTests.java

@@ -155,7 +155,7 @@ StorageOptions createStorageOptions(
                     @Override
                     public HttpRequestInitializer getHttpRequestInitializer(ServiceOptions<?, ?> serviceOptions) {
                         // Add initializer/interceptor without interfering with any pre-existing ones
-                        HttpRequestInitializer httpRequestInitializer = super.getHttpRequestInitializer(serviceOptions);
+                        HttpRequestInitializer httpRequestInitializer = httpTransportOptions.getHttpRequestInitializer(serviceOptions);
                         return request -> {
                             if (httpRequestInitializer != null) {
                                 httpRequestInitializer.initialize(request);