[Train][release_test] Update release tests for xgboost and lightgbm trainer to V2

[hongpeng-guo]

Why are these changes needed?

This PR upgrades the release tests for XGBoostTrainer and LightGBMTrainer from a previous version to a recent version. Both trainers are now subclass of DataParallelTrainer, similar to TorchTrainer

Related issue number

Checks

• I've signed off every commit(by using the -s flag, i.e., git commit -s) in this PR.
• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/master/.
  • I've added any new APIs to the API Reference. For example, if I added a
    method in Tune, I've added it in doc/source/tune/api/ under the
    corresponding .rst file.
• I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • Unit tests
  • Release tests
  • This PR is not tested :(

[justinvyu]

Thanks! I just ran the release test, and if that passes, we can merge.

[justinvyu]

Release test: https://buildkite.com/ray-project/release/builds/27902

[hongpeng-guo]

The new release test link is here: https://buildkite.com/ray-project/release/builds/28263

[hongpeng-guo]

Update: the release test passed.

[hongpeng-guo]

@justinvyu @matthewdeng Please merge :)