[tf.data service] Package local credentials into server_lib.

This way, tests don't need to explicitly depend on local credentials, which can cause Bazel issues
due to depending on cc libraries from tf_py_test.

PiperOrigin-RevId: 306524831
Change-Id: I67dd59348691608845b149e2d0dc5f1190e69d9f

tensorflow/core/data/service/BUILD

@@ -279,6 +279,7 @@ cc_library(
         ":credentials_factory",
         ":grpc_master_impl",
         ":grpc_worker_impl",
+        ":local_credentials_factory",
         "//tensorflow/core:lib",
         "//tensorflow/core:tensorflow",
         tf_grpc_cc_dependency(),