[breaking] Remove the predictor param, allow fallback to prediction using DMatrix. (#9129)

- A `DeviceOrd` struct is implemented to indicate the device. It will eventually replace the `gpu_id` parameter.
- The `predictor` parameter is removed.
- Fallback to `DMatrix` when `inplace_predict` is not available.
- The heuristic for choosing a predictor is only used during training.

src/tree/updater_gpu_hist.cu

@@ -226,9 +226,7 @@ struct GPUHistMakerDevice {
     monitor.Init(std::string("GPUHistMakerDevice") + std::to_string(ctx_->gpu_id));
   }
 
-  ~GPUHistMakerDevice() {  // NOLINT
-    dh::safe_cuda(cudaSetDevice(ctx_->gpu_id));
-  }
+  ~GPUHistMakerDevice() = default;
 
   void InitFeatureGroupsOnce() {
     if (!feature_groups) {