remove cufile.log in xgboost-randomforest-gpu-hpo-dask example

Proposes removing the cufile.log checked into source control here.

There's already a .gitignore rule to avoid this:

But I suspect this particular file was already in source control prior to that rule being added.

Trying to ad the file back shows that the .gitignore rules is working:

echo "abc" > ./source/examples/xgboost-randomforest-gpu-hpo-dask/cufile.log
git status

rapidsai / deployment