Upgrade clang-tidy on CI. (#5469)

* Correct all clang-tidy errors.
* Upgrade clang-tidy to 10 on CI.

Co-authored-by: Hyunsu Cho <chohyu01@cs.washington.edu>

tests/cpp/common/test_transform_range.cu

@@ -5,7 +5,7 @@
 namespace xgboost {
 namespace common {
 
-TEST(Transform, MGPU_SpecifiedGpuId) {
+TEST(Transform, MGPU_SpecifiedGpuId) {  // NOLINT
   if (AllVisibleGPUs() < 2) {
     LOG(WARNING) << "Not testing in multi-gpu environment.";
     return;