Card - add new variant 'inset image'

[nicolethoen]

Figma Link

https://www.figma.com/design/qRn3S225WwGHIdgGZX0LTC/Unified-Theme--Design-Tokens--Styles---Specs?node-id=10967-17394&m=dev

Jira/GitHub Ticket Link

TBD

Design Screenshot

Any extra notes for developers

This is a follow up to the Unified theme Card issue: #8086

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Jira Issue: PF-3549

[coderabbitai]

🔗 Related PRs

#8154 - feat(ToggleGroup): unified theme updates [merged]
#8165 - fix(button): apply unified tokens and new icons [merged]
#8193 - feat(nav): unified theme updates [merged]
#8216 - feat(tabs): update to unified design icons and tokens [merged]
#8219 - feat(card): update card to use unified theme tokens [merged]

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