[WIP] Address feedback on removing sklearn gradient booster options

[Copilot]

Thanks for the feedback on #244. I've created this new PR, which merges into #244, to address your comment. I will work on the changes and keep this PR's description up to date as I make progress.

Original PR: #244
Triggering review: #244 (comment)

This is the current text, @copilot. This suggestion makes no sense and references an older version of the file.

# we were unable to import the xgboost module. It's either not
# installed (it should be if the user installed JABS as a package)
# or it may have been unable to be imported due to a missing
# libomp. Either way, we won't add it to the available choices and
# we can otherwise ignore this exception

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