Parallelize facade.validate()

I wanted to make a feature request/wish but don't know how to label it as such.

It would be great if the validation of incumbent and default configuration could be run on a a dask runner to parallelize them. Currently, when running on a cluster, the validation runs on the login node, while the worker nodes sit idle.

I saw this comment in `smbo.py`, so maybe this is already planned:
```Python
# TODO: Use submit run for faster evaluation
# self._runner.submit_trial(trial_info=trial)
_, cost, _, _ = self._runner.run(config, **kwargs)
```

Start at facade.validate() and read the related flow in smbo.py, especially the TODO around _runner.submit_trial() and the current _runner.run() call. Trace how incumbent and default configuration validation reaches the runner and how the Dask runner is used. Done means those validations execute on worker nodes instead of the login node, with behavior preserved for cluster execution.

Written by the indexing model from the issue text.