[tf.data] Increase the roll out percentage of optimization `enable_gradient_descent` to 100%.

PiperOrigin-RevId: 340252424
Change-Id: Ic5a5d347c38fd94b68e10373c0b66ea3043f2e9b

tensorflow/core/kernels/data/optimize_dataset_op.cc

@@ -84,7 +84,7 @@ void OptimizeDatasetOp::MakeDataset(OpKernelContext* ctx, DatasetBase* input,
     // of the Borg jobs, the experiments will be randomly turned on.
     // clang-format off
     absl::flat_hash_map<string, uint64> live_experiments = {
-        {"enable_gradient_descent", 50},
+        {"enable_gradient_descent", 100},
         {"map_parallelization", 1}
     };
     // clang-format on