Component Update: split check with label menu toggles

Update all instances of the [split check](https://staging-v6.patternfly.org/components/menus/menu-toggle/html/#split-button-action) component to include a divider between the text and drop down caret, include hover, focus and default states. 

related issue: https://github.com/patternfly/patternfly-design/issues/1320