Card: Add Collapsable card variant

Adding a collapsed version of the Multi Content Card. There are now 3 states: Collapsed, Expanded, Expanded with dividers.

https://www.figma.com/design/MSr6kVEOuAxmPOkjg7x8PO/PatternFly-6%3A-Patterns-%26-Extensions?m=auto&node-id=2-15&t=LZR8fKuZavOVS1Ub-1