bounded_order_preserving_variants configuration setting is confusingly named

[alamb]

Is your feature request related to a problem or challenge?

While debugging an issue upgrading our code to use DataFuson, @ozankabak pointed me at the following config: #7671 (comment)

This setting (I think) controls if the DataFusion planner should prefer using the existing sort order or trying to maximize paralleilsm using repartition and re-sorting

It turns out to be the right one, but I don't think I would have found it without @ozankabak 's suggestion

Describe the solution you'd like

I would like to more easily understand what the setting does from an end-user perspective -- with some better docs and a different name (prefer_existing_sort)

Describe alternatives you've considered

We could also just update the docs and leave the name alone

Additional context

No response