DataViewTreeViewFilter: Add prop to toggle visibility of "Close label group" button #644

Hello,

During a recent PR review, we noticed that the DataViewTreeViewFilter contains an extra button ("Close label group <filter_name>") in the chip toolbar that isn't present in other data-view filters:

I’d like to propose adding a prop (e.g., showDeleteLabelGroup) to control this behavior

It appears that in the ToolbarFilter component, the button's visibility is tied to the presence of the deleteLabelGroup function. If we provide a way to ensure this remains undefined or is explicitly disabled via a prop, the button should remain hidden as expected

Many thanks for considering the change!

Jira Issue: PF-4094